Monday, February 21, 2011

Lake Chelan

One of my favorite things about gold prospecting is the opportunity to visit and explore new places. I have been to areas so far off the beaten track that the hustle and bustle of civilization seemed like a distant memory. Other times, I’m pretty sure I was the only one in the crowd that was thinking about gold panning. That’s what happened last Labor Day when I took a long, 50-mile ferry ride up Lake Chelan, Washington to the Stehekin River.

To set up the trip, I relied on Internet links to the local chamber of commerce, to various services companies, and for historic information. It went pretty smoothly, too, and there was still enough of a spirit of discovery to stop at local wineries, fruit stands, and viewpoints to keep my partner interested.


Figure 1. Map showing the route through several northern Washington gold districts.

One good link to use when planning a trip to Washington is www.experiencewa.com. You can use the links on this page to to run down activities, lodging, dining, and other tourism-related topics. If you know the state, you probably don’t need this much information, but if you’re new to the Pacific Northwest, these folks can help. Their Travel Planner “catalog” is thick and impressive.

History

The name Stehekin is taken from the Skagit Indian word, which means “the way through.” Crossing the North Cascades proved a challenge for Indians and trappers alike, but it was possible to track up Lake Chelan, follow the Stehekin to its source basin, and drop back over to the western side of the Cascades.

Once mineralization was discovered at the headwaters of the Stehekin River, there were immense challenges in getting any ore to the smelter at Tacoma. According to the Northwest Underground Explorers, “The majority of the Stehekin mining area is underlain by pre-Upper Jurassic gneisses, many migmatic in nature. To the northeast of the Stehekin River lies an exposed, narrow band of pre-Upper Jurassic metamorphic rocks, running from southeast to northwest. The headwaters of Bridge Creek rise in Tertiary-Cretaceous, intrusive, igneous, granitic rock that contacts the gneisses along a broad zone in the region of the McGregor Mountain ridge. The mineral bearing zones were found throughout the gneisses and along the contacts between dissimilar rocks. The area is not heavily mineralized, and with few exceptions, mining never really gained a foothold there. Several of the properties assay highest in gold or silver, but by far the majority assay highest in lead.” (vol. 2, p. 35)

At the Skagit River journal site, found at http://www.skagitriverjournal.com/Portal/MiningSec.html you can get an overview of the history of North Cascades mining, and in particular the Skagit district, which was the first big rush to the area. “Jack and George Rouse [actually Jack C. Rouse and George L. Rowse] were among the first prospectors in the district and located the Boston mine. The district also had its lost mine like other places. A company of solders came over the pass in the early days and one of them found some rock that reportedly showed much gold. It was later searched for and the Soldier Boy claim was located on what was thought to be the place the gold-bearing rock came from. The only ore I took [from] there showed only iron pyrite. . . .”

Although the Rouse was happy mining in Washington, he, too, felt the call of the Yukon:

“…George decided to follow gold seekers to the Klondike river region of southeast Alaska in 1898. He initially staked a claim on Seventy-mile creek and then in the fall, he returned to Dawson to work in a claim on Bonanza Creek. But in 1899 he went first to Nome and then returned to Seattle via Dutch Harbor, deciding that Washington mines were more promising. He missed the Nome gold rush by a year. From then on, according to the 1904 book, he invested ‘his entire time and energy to the development of the properties above mentioned’ at the Boston Mine.”

According to Roy Mayo, in his book Washington State Gold Mines, “Placer gold has been found on beaches in several places on Lake Chelan. Many creeks along the upper part of the lake will produce some gold. Railroad Creek has had several good placers. The Stehekin River has produced placer gold for several miles above it’s mouth.” (p. 58) It was Mayo’s information that first spurred me to explore the upper area of Lake Chelan.

Getting there

The route we took was circuitous, to say the least. We drove up I-5 to Sedro-Woolley and turned east on WA 20, going through Concrete and Marblemount to reach Ross Lake National Recreation Area and the North Cascades National Park. Here’s a link for the North Cascades park complex: http://www.nps.gov/noca. The first night, we camped at Goodell Campground. You can find a map of the site at http://www.nps.gov/noca/planyourvisit/upload/Goodell.pdf. This campground has great access to the river, but it’s close to the highway, and a better choice would probably have been Newhalem, only another mile up the road. Here’s the map: http://www.nps.gov/noca/planyourvisit/upload/newhalem%20loops.pdf.

In fact, the campgrounds are so close together that a National Park Service ranger came through in the morning and invited us over to Newhalem for coffee and cobbler. I poked my nose into the gift shop to see if any of my rockhounding books were on sale there (they weren’t) and picked up an annual parking pass.

For day 2, I did some exploring for an upcoming book on gold prospecting in the Pacific Northwest. There’s no contract and no schedule, so mostly it was a great excuse to check out a couple of spots in Washington’s obscure North Cascades area. Plus, it’s a very scenic route. First, we checked around the Ruby Arm of Ross Lake. We parked at the Canyon Creek trail head, then hiked past the cabin and sampled a few spots up Canyon Creek. Thanks to my membership in the Washington Prospectors Mining Association, I was there by permission. You can check them out at http://www.washingtonprospectors.org.

Figure 2. Scenic Diablo Lake, part of the North Cascades National Park.

This low on Canyon Creek, I didn’t find much coarse gold. There was good black sand, plenty of moss on most of the boulders, and nice exposures of bedrock right in the water. The concentrates also contain beautiful, if small, purple-red garnets. Even this late in the summer, the water was numbingly cold.

After that we drove over Washington Pass and stopped at the scenic viewpoint. The Golden Horn Batholith juts out here, and rockhounds have pecked at the edges of the granite pluton for years, searching for quartz crystals and other specimens. Lanny Ream’s book Gems and Minerals of Washington is a great source of information if you’re interested.

We continued on to Mazama, turned north by northwest, and set our sights on Hart’s Pass. The road is steep and narrow in places, and definitely gets your attention, but the views of the Methow River valley are amazing. I thought the slate outcrops were pretty nice, too. We reached the pass and turned off to the southwest to access Slate Creek. This area is claimed up pretty well, but again I was there by permission, and I did very well. In just under an hour of panning and picking at crevices, I was able to recover some coarse flakes very quickly. I found a spot right on bedrock, with moss, crevices, crooks and crannies, and I came away very impressed. I would definitely go back to Slate Creek.

Figure 3. Methow Valley, from the road to Hart's Pass.

From there we backtracked to Mazama and continued east on WA 20 to Winthrop, a very fun little town that was really hopping for the Labor Day weekend. We skipped several more gold districts on the Twisp River and on the Methow River so that we could get to a motel in Pateros. Just a warning: just about every motel and resort in Chelan wanted a three-night minimum for the Labor Day weekend, and most were completely full.

The third day, we got up early and drove to the ferry by 8:30 a.m., then settled in for a long boat ride up Lake Chelan. You’ll find complete schedule and passenger information at http://www.ladyofthelake.com. We opted for a combo of fast ride up, three-hour layover, and then a slow ride back. It was a warm day, and it felt very relaxing to nod off and feel the heavy sound of the straining diesel engines.

Figure 4. The only way to get to the mouth of the Stehekin River is by float plane or ferry.

One side note – the boat does stop at Railroad Creek, which is a known gold producer. I opted to skip that prospect, but it’s there for another time. Most of the old guides and atlases mention Railroad Creek and the Holden Mine, so if anyone ever checks it out, I’d sure like to hear about it.

Once at Stehekin, we quickly rented bicycles at Discovery Rentals. These folks were fantastic, getting us on the road in no time. Here’s their website: http://stehekindiscoverybikes.com. Next, we headed north on nice 18-speed mountain bikes. We stopped for a box lunch at the bakery, officially called The Stehekin Pastry Company (http://www.stehekinpastry.com). Their sandwiches are hearty and their service is fast. In no time we were headed up river. About four miles from the boat, around the Company Creek Campground, we were finally out of most of the private land. At about five miles up, there was a nice big bend in the river, with plenty of exposed gravel. If you go too far north, at about 10 miles from the boat dock, you’re into National Park land. As most of us know, there’s no panning in any national park or national monument. So we got above the private land and stayed below the park service boundary. I found a fairly decent spot near the bridge to the campground, too, and since the water was low, I could work in and around some big boulders.

Note that this is one of those perfect opportunities for a fold-up sluice. I had recently purchased the Jobe fold-up sluice, which you can see at http://www.jobewholesale.com/jobe-folding-sluice.htm. I bought mine at Blue Bucket Mining Supplies in Bend, Oregon. Their link is http://www.bluebucketmining.com. My contact there is Tina Vickers, who maintains an active Facebook presence.

I have to confess, that water is COLD! It was hard to stay in for very long. I made some pretty good concentrates, panned occasionally to see how I was doing, and was rewarded with lots of black sand and many very small colors. I can officially report that there is decent color in the Stehekin, and I added my concentrates to the “collection.”

On the way back down from the river, we stopped at Rainbow Falls and checked that off the list – it’s beautiful. The trip back on the lake was relaxing, and I got in a good nap. We reached the dock at a decent time and drove south to Entiat, then up the Entiat River to the Pine Flats campground on the Mad River. The link to check it out is at http://www.us-parks.com/camping/wa/pine-flats-campground.html. There was plenty of room, and we enjoyed a good bonfire that night.

The final day, I got up and sampled the Mad River at several places. The campground had a great access point, but with several big mossy boulders to scratch at. Lower down, below Pine Flats, I found some excellent bedrock exposures where the cracks were lined up perfectly to act as riffles. I sampled them quickly, and found excellent black sand and some decent colors. Next, I sampled some claims on Indian Creek, and the concentrates there were not as promising as I would have liked. But to make up for it, I found several small, gray flakes that are probably platinum.

On the way down, we detoured up Crum Canyon, but there is very little water in this area by late summer. Also, there was lots of private land to negotiate. I ran out of time to check the abandoned mine there.

Figure 5. Overview map of North Cascades in Washington, from Gold Diggers Atlas. Click to make it bigger and more clear.

We came home via Blewett Pass, Liberty, Swauk Creek, and Peshastin. I’ve checked many of the creeks up there in the past, and written up the area for these pages. If you’ve never visited Liberty, or tried your hand in the open recreational area along the Swauk, you’re in for a treat.

Summary

This area is fun to explore in late summer. The temperatures still get hot during the day, but you’ll cool off by night-time. There are many, many old districts to explore, and it’s hard to pick one as “best.” I’ve explored up here several times, but I still have a lot of work to do. But that’s the fun part about this hobby, right?

Additional readings

Mayo, Roy F., Washington State Gold Mines, Nugget Enterprises, Enumclaw, WA. 1983. 80 pgs.

Johnson, Robert Neil, Gold Diggers Atlas, Cy Johnson & Son, Susanville, WA. 1971. 64 pgs.

Koschmann, A. H., and Bergendahl, M. H., Principal Gold-Producting Districts of the United States. U.S. Geological Survey Professional Paper 610. 1968. 283 pgs.

Northwest Underground Explorations, Discovering Washington’s Historic Mines, Volume 2: The East Central Cascade Mountains and the Wenatchee Mountains. Oso Publishing Co., Hamilton, MT. 2002. 336 pgs.

Northwest Underground Explorations, Discovering Washington’s Historic Mines, Volume 3: The Northern Cascade Mountains. Oso Publishing Co., Hamilton, MT. 2006. 315 pgs.

Ream, Lanny, Gems and Minerals of Washington, 3rd Ed., Jackson Mountain Press, Renton, WA. 1994. 217 pgs.

Smith, Jerry, Boom Towns and Relic Hunters of Northeastern Washington. Elfin Cove Press, Bellevue, WA. 124 pgs.

Garret Romaine writes from Portland, Oregon. You can find him online through his Facebook page.

Product Report: Gotcha Water Table and Magna-Two Magnetite Remover

As long as I can remember, I’ve been curious about the gold content of Oregon’s beach sands. I’ve collected concentrates by the bucket, and tried to work them down with my existing tools, but it’s always been something of a fool’s errand. There is so much magnetite that the material is very difficult to pan. What little gold there is can make the head of a pin look like a football field. And there really isn’t that much gold to begin with.

Now, I’m happy to report, I finally found a pair of tools that work on every type of sample possible, including extremely fine beach sands. Reader and inventor Bill Martsolf contacted me recently and asked if I would be interested in trying out the Gotcha Water Table and the Magna-Two magnetite remover. I had collected many concentrate samples over the last couple of years, so I agreed, and he sent them to me right away.

Magna-Two Magnetite Remover

First, I checked out the Magna-Two, which works on dry material. I dumped a few pounds of beach sands into my largest plastic pans, let them dry for a week, and then ran them through my fingers. The material was dark, heavy, and powdery.

Whenever I’ve used magnets to clean sand, I’ve always been nervous about pulling out gold. Indeed, about every time I’ve panned the magnetic sand removed by a magnet, I’ve found pinpricks of gold in there. Maybe you’ve tried it and found the same thing – you grab your big magnet, drag it through the concentrates, and create this big, long, black beard. You just know it’s robbing you.

The Magna-Two solves for that by adding vibration to its magnetic system. You can see from Figure 1 that the contraption is simple. It works on gravity and electricity, and is easy to operate. Turn on the power source, made of eight 1.5V batteries, and the action begins. Powerful magnets reach through the sheet aluminum, while the motor rattles the tray vigorously, vibrating away any non-magnetic material.

Figure 1. Magna-Two magnetite remover, sitting in a shallow plastic tub (not included).

When I worked with my beach sand sample, several big, dark magnetite “blobs” or “islands” soon appeared, as black magnetite was pulled to the magnet, while the pay dirt poured off the end into a tub or tray. From Figure 2, you can see that the magnetite starts to grow spikes and tendrils when it’s ready to dump. Once you have built up a lot magnetite, you stick a small pan or plastic tray under the ramp, lift it from the magnets, and the magnetite runs off.


Figure 2. Small magnetite "islands" starting to build.

It doesn’t take long to figure out how to sprinkle your concentrates lightly so that the magnets can work most efficiently.

I ran my beach sand material through the Magna-Two several times and got it as clean as I could. Finally, it was time for the Gotcha Water Table.

Gotcha Water Table

The water table works on gravity, with a water pump in a large tub that re-circulates constantly. Once you get it set up, following the easy instructions, you add a few drops of Jet-Dry automatic dishwasher conditioner, which serves to reduce the surface tension of the water. This makes sure that your finest gold doesn’t float away.

A very thin sheet of water flows across the green table surface, fast enough to carry away light material, but not so boisterous as to move the heavier gold. There are no riffles – the surface rough enough with its painted surface, full of micro pits and bumps. Bill painted the surface with the familiar green chalkboard paint, which gives the surface a little roughness, and improves your ability to see even the tiniest gold colors. Refer to Figure 3.

Figure 3. Gotcha Water Flow Table.

After so many years in the field, I had collected quite a shelf of concentrates from all my travels. In additional to my big bottles of beach sand, I had saved material from Oregon, Washington, and Idaho, some marked, some that only I knew, and a few “mystery” jars that I could only guess about. Some of the bottles in Figure 4 were themselves collections from a weekend trip or from an entire summer. It was time to throw caution to the wind and start working them down.


Figure 4. Full sample jars from various outings.

All of these samples were still wet, but they were quite small, and I didn’t think they’d choke the Water Table if I was careful. I was right. By just sprinkling material onto the top of the table, I could control how fast the system worked. The water flow pushed slowly but surely against the concentrates, and the lighter material flowed quickly downwards.

Sure enough, I could tell almost instantly if there was significant gold present. I had watched Bill’s YouTube video about the process, located at http://www.youtube.com/user/nuggetbill#p/a/u/1/16REqjjWGKw, and it helped a lot. (I know that’s a long URL; you can just search on “nuggetbill” and pull up his four videos.) I found that it wasn’t that hard to figure out how to use the included paintbrush to move material around, and because it’s a closed system, you can’t really lose anything.

By treating the side closest to me as “the gold zone” and moving material toward it carefully, I soon began to accumulate a small pile of gold from my first sample. There were some bigger flakes, and I started to wonder where this bottle was from. Then I realized it was a ringer – I’d picked up a sack of Tom & Perry’s gold concentrates at a recent gold show, and cleaned it using my Gold Magic panning machine. No wonder it was so rich. See Figure 5.


Figure 5. Carefully brush the clean gold to one side for easy pickup.

Still, using a sample with gold in it really helped me learn the system. I slurped all the gold into a small snuffer bottle, which I tested to make sure had no gouges or scratches. Otherwise, you’d have to sand the snuffer end smooth. The green surface is really sensitive, and you can easily scratch it if you have big rocks or a rough snuffer bottle tube. I put a scratch in mine just unpacking it.

As I kept cleaning up small sample jars, old snuffer bottles, and other odds and ends, I got the hang of the action really fast. The paint brush revealed buried gold with a small flick, and the water pushed the waste material away with brutal efficiency.

Some of my samples were devoid of gold, and some had just one or two tiny pieces of flour gold. The water table was cleaning everything up quickly, and it was fun to go through bottles that I’d been saving for just such a day.

Soon, I felt confident enough to try the beach sands I’d collected the last time I was at the coast. The entire process was as follows:

1. Collect material and put into pop bottles

2. Dry the material in a big gold pan

3. Remove the magnetite with the Magna Two unit

4. Run the concentrates through the spiral pan

5. Run the remaining concentrates through the Gotcha Water Table

I cleaned five pounds of black beach sands down to a half-cup of what I hoped was pretty good stuff. I started slowly sprinkling it out, and sure enough, I began to see small pinpoints of gold in the material. There wasn’t much, and it was all very small, but I could see them. I began slurping them up with a snuffer bottle, and saw that I was getting a really clean sample. At last, I had found a way to liberate gold from beach sands without using mercury, nitric acid, or any other environmentally questionable method.

Here’s the result of all my labors for the afternoon in Figure 6:

Figure 6. Clean gold extracted in a single afternoon from multiple samples.

Some of my ideas would probably run the cost up, and Bill is trying to keep the unit affordable. According to the ad at http://gpex.ca/ads/gotcha.html the unit costs just $215, plus shipping, which is a bargain as far as I can tell. There is a very nice discussion there, where experts argue the advantages of blue bowls, spiral pans, water tables, and plain old-fashioned panning.

There is also a discussion about the Magna-Two: http://gpex.ca/smf/index.php?topic=2685.0;wap2. The cost for the Magna-Two is $142 plus shipping. If you want more information, Bill’s email address is martsolf22@msn.com.

Summary

Back in the earliest days of the GPAA television shows, founder George Massie used to tell a story about cleaning up his concentrates in an outside shack, where it was cold and drafty. He didn’t mind too much, he said, and he’d take his time, cleaning up buckets of gold-rich black sand with all kinds of contraptions. Still, he admitted, it would be better to be able to do his cleanup inside the warmth of his own house.

If I remember the story right, when he found a big bonanza hole on the Stanislaus River, and recovered about 800 ounces of gold in one summer, he was finally allowed to do his clean-up in the front room. Which just goes to show – if you find enough good material, a lot of your problems will be solved.

Garret Romaine has been writing for GPAA since 1996. He is the author of Gem Trails of Oregon, Gem Trails of Washington, and Rockhounding Idaho.

Meteorites, Magnets, and Metal Detecting

I’ve probably been watching too much “Meteorite Men” on the Science Channel. I’m starting to see little rusty rocks everywhere I go, and since I visit a lot of gravel bars in the course of rockhounding and gold prospecting, I’m getting nervous that I’ve passed over a valuable piece of space debris. If you haven’t caught meteorite fever yet, try this website: http://meteoritemen.com and check out the stories there. You can even purchase a space rock of your own, such as the Gibeon fragment from Namibia worth about $3,300, shown in Figure 1.

Figure 1. (Left) The Gibeon meteorite, from Namibia, weighs about 3,600 grams and is for sale at www.aerolite.org for $3,300.

In one of the latest episodes, the two meteorite hunters traveled to the Atacama Desert in Chile to visit a known “strewn field” where they had found fragments in the past. Many times, they use metal detectors for their work, including one time when they rigged up a giant ten-foot array detector that they towed behind them in a Kansas wheat field. They found a huge space rock about six feet beneath the soil thanks to that contraption.

This time, they rigged up a drag board fitted with dozens of powerful rare-earth magnets, and hooked it to their pickup truck. They repeatedly raked the red desert floor and managed to attract dozens of little pieces of iron, worth between $5 and $10 per gram. They also devised another big array detector and found a larger piece, worth almost $20,000.

We all know there are about 31 grams in a troy ounce, and with gold at about $1300 per ounce, that works out to around $40 per gram. Some of the very rare pallasite meteors are worth about the same amount.

Obviously, a metal detector that can search for gold and iron would be a nice purchase. More on that in a minute. My low-tech solution was to purchase a used golf putter at the local Goodwill store, and pick up a fancy round magnet at one of the many online sources, such as http://www.magnet4less.com.

Before going further, here’s something you should know – these neodymium-based magnets are much more powerful than you’re used to. At www.UnitedNuclear.com, they provide this warning:

“Neodymium magnets are very powerful, much more powerful than magnets most people are familiar with and need to be handled with proper care. The magnetic fields from these magnets can affect each other from more than 12 inches away. Please note that these magnets are fragile. Even though they are coated with a tough protective nickel plating, do not allow them to snap together with their full force or they may chip, break, and possibly send small pieces of metal flying on impact. Our magnets can easily bruise fingers and the larger ones can break finger bones and even crush hands as they attempt to connect together.”

I can attest to that, but the way. I had two rectangular neodymium magnets about two inches long, an inch wide, and a half-inch thick. They looked like fat dominoes. Or, one still does. When I was dinking around with them, they flew together with a loud “clap” and one of them busted into halves, with additional fragments flying around. One went whizzing past my ear like an angry hornet, and another carved a deep scratch in my finger, drawing blood. On that same Atacama desert episode of “Meteorite Men,” prospector Steve Arnold got his fingers pinched between two magnets and he, too, donated blood.

My New Magnet

So, here’s what I put together, as shown in the figures below:

Figure 2. (Left) Giant neodymium-based ring magnet. You can see it’s been dragged through the dust already, and has picked up some magnetite, black sand, or iron.

Figure 3. (Right) Used golf putter with various magnets attached to the head of the club, and the big ringed magnet sitting on top. Total cost was about $40.


Figure 4. Trash, black sands, and hot rocks picked up around the campfire. Nickel is for scale – magnets don’t pick up most coins.


Famed comedian W.C. Fields once observed there were two ways to travel: first-class, and with children. I sometimes feel the same way about camping. Kids are great fun, and opening up a world of science and discovery is a treat. But the way they run around without any shoes, risking a rusty nail and subsequent tetanus shot, is enough to drive me crazy. I’ve decided I can justify dragging my putter magnet around the campfire a few times because I’m sure to clean up a lot of rusty nails and other trash. I’m a one-man camp cleaner. You can see one of my hauls in Figure 4. In the more popular US Forest Service campgrounds, I’ve run a quick pass over the gravels where I park, and I’ve picked up quite a few nails from perilously close to my tires.

Here are some more links and some background information about neodymium magnets, found at www.kjmagnetics.com.

Rare Earth

“Neodymium magnets are a member of the Rare Earth magnet family and are the most powerful permanent magnets in the world. They are also referred to as NdFeB magnets, or NIB, because they are composed mainly of Neodymium (Nd), Iron (Fe) and Boron (B). They are a relatively new invention and have only recently become affordable for everyday use.

Grades of Neodymium

N35, N38, N42, N38SH...what does it all mean? Neodymium magnets are all graded by the material they are made of. As a very general rule, the higher the grade (the number following the 'N'), the stronger the magnet. The highest grade of neodymium magnet currently available is N52. Any letter following the grade refers to the temperature rating of the magnet. If there are no letters following the grade, then the magnet is standard temperature neodymium.

Platings/Coatings

Neodymium magnets are a composition of mostly Neodymium, Iron and Boron. If left exposed to the elements, the iron in the magnet will rust. To protect the magnet from corrosion and to strengthen the brittle magnet material, it is usually preferable for the magnet to be coated. There are a variety of options for coatings, but nickel is the most common and usually preferred. Our nickel plated magnets are actually triple plated with layers of nickel, copper, and nickel again. This triple coating makes our magnets much more durable than the more common single nickel plated magnets. Some other options for coating are zinc, tin, copper, epoxy, silver and gold. Our gold plated magnets are actually quadruple plated with nickel, copper, nickel and a top coating of gold.

Demagnetization

Rare Earth magnets have a high resistance to demagnetization, unlike most other types of magnets. They will not lose their magnetization around other magnets or if dropped. They will however, begin to lose strength if they are heated above their maximum operating temperature, which is 176°F (80°C) for standard N grades. They will completely lose their magnetization if heated above their Curie temperature, which is 590°F (310°C) for standard N grades. Some of our magnets are of high temperature material, which can withstand higher temperatures without losing strength.”

Neodymium Magnet Information

More background information about neodymium magnets: http://www.kjmagnetics.com/neomaginfo.asp.


Neodymium Glossary

More than you ever thought you could learn about magnetism and magnets. Here’s a full glossary with more details about magnets: http://www.kjmagnetics.com/glossary.asp

Picking a Metal Detector

Magnets are cheap and easy, but I’m planning to replace my old Minelab metal detector in the coming year. I’ve been haunting the websites of two manufacturers: White’s at http://whiteselectronics.com and Fisher at http://www.fisherlab.com.

Getting back to the Meteorite Men, they had this to say on their website about their metal detector:

“If you've watched the award-winning series Meteorite Men on Science Channel, Discovery, Quest, or one of our other networks, then you've seen Geoff and Steve using the remarkable new Fisher F75. This extraordinary, top-of-the line detector is lightweight, perfectly balanced, extremely sensitive and the Meteorite Men's hand-held detector of choice. And it's a meteorite-finding machine.

The Meteorite Men used their F75s with great success at Canada's amazing Whitecourt Crater, at Gold Basin in Arizona, at the famous Odessa, Texas meteorite crater, on the search for the legendary Tucson Ring, and at many other secret locations. If you want to up the odds of finding your own space rock, then you need to be using the best equipment out there, and that's the F75.

The Meteorite Men are delighted to offer the very same unit that they've worked with throughout Season One and Season Two. Purchase directly from us and you will receive an exclusive color photo of Steve and Geoff, along with a genuine Sikhote-Alin iron meteorite (witnessed fall, Russia, 1947), so you'll know exactly what a meteorite sounds like when your detector goes over it.”

Cost is about $1,249. That’s a little steep for most of us to justify to our Chief Budget Officer, so they advertise a “starter” GoldBug for about $550.

The White’s GMT costs about $800. I logged onto their site and got this report:

“The White's GMT is a good choice for a low-end gold detector. By using the term ‘low-end’ I don't mean cheap quality, just low price. The GMT can be purchased for about $800.00 new and $500.00 used. It does have some problems with Arizona's heavily mineralized areas but can handle them decently with effort and practice. It can find gold as small as .02 gram with my experience and of course larger pieces. The fact that the GMT is a VLF or very low frequency detector means it can discriminate iron trash very well. In fact from my experience I'd say the discrimination is 99.9% accurate on trash. The digital scale normally shows gold at 25 or lower. What I am referring to is the digital ‘scale’ called ‘Probability of Iron’….

“The real upside to this unit is if you hunt old mine dumps or tailings piles. This is where the true dual purpose of this gold detector comes into play. While the more expensive pulse induction (PI) gold detectors will outshine the GMT or any VLF for the most part in the washes and hillsides, they won't be able to match the GMT's performance in mine dumps and tailings. Not only will the GMT find more gold in old mine tailings and mine dumps it will also tell you when a target is just an old nail or piece of iron junk accurately. It is also not affected by power lines like the more expensive PI units. It is also much lighter in weight than the more expensive PI units if that is a concern for you.

“So if you are looking for an entry level gold metal detecting gold prospecting machine that will do ok hunting washes and hillsides for gold and will absolutely shine in old mine dumps and tailings the GMT might just be the ticket.” (http://whiteselectronics.com/gmt.html)

Fisher F75 Special Edition

Alaska Mining and Diving Supply is a great spot for deals, background information, well-written stories, and more. As of this writing, they had a sale going on F75 units.

http://www.akmining.com/mine/fisher_f75_metal_detector.htm

Fisher Gold Bug 2 - About $800

As stated above, this is a solid detector that works for meteorites, gold, and coins.

http://www.kellycodetectors.com/fisher/fishergold-goldbug2.htm

http://www.akmining.com/mine/fisher05.htm

Coin hunting

I ran across a nice website recently devoted to coin hunting with a metal detector.

Figure 5. This 1875 Swiss half-franc silver coin popped up in southern Illinois recently. How it got there is a mystery… Check www.coinhunting.net for more info about recent finds.

More Meteorite Links

http://www.meteoritesusa.com/meteorite-articles/wisconsin-meteorite-strewnfield-map/

Great information, and tons of links to keep you researching for days.

http://meteorites.wustl.edu/numbers_by_state.htm

Good map and graph of known discoveries in the U.S.

http://www.lpi.usra.edu/meteor/metbull.php

A solid database of discoveries.

http://www.delostooleauthor.com/meteorite_fall.html

Delos Toole’s map of Arizona discoveries.

http://www.meteoritemarket.com/

Claimed to be the oldest and best place to buy meteorites. Also has a key to determine if what you have is really a space rock: http://www.meteoritemarket.com/metid1.htm.

http://epswww.unm.edu/meteoritemuseum/index.htm

University of New Mexico meteorite museum.

http://news.discovery.com/space/meteorite-impact-crater-google.html

Recent meteor crater found with Google Earth.

http://bbs.keyhole.com/ubb/ubbthreads.php?ubb=showflat&Number=279959&site_id=1#import

Google Earth add-on showing 26,000 worldwide meteor impacts; in .kmz format.

http://www.wired.com/wiredscience/2010/08/crater-hunting/

Physicist Amelia Sparavigna of Politecnico di Torino in Italy found a 6-mile-wide crater in the Bayuda desert in Sudan using Google Maps, a free astronomical image-processing program she helped develop called AstroFracTool, and open source image-processing tool GIMP. The work appeared on ArXiv Aug. 3.

Summary

No matter what tool you’re using out there, practice and experience is a big key. Good luck!

Garret Romaine writes from Portland, Oregon.

Wednesday, November 17, 2010

New video - Washington State Jade Rendezvous

In this episode, I traveled to Darrington, Washington for the first-ever Washington State Jade Rendezvous. I had documented the Oso area, among others, as a prime jade locale in my "Gem Trails of Washington" book, but this was even better. We hooked up with several local experts, and you'll see about a ton of nice material collected from the area. In addition, I met up with Ed Lehman, famed wagon-master for the Washington State Mineral Council, and also interviewed Lanny Ream, author of "Gem Minerals of Washington" and one of the premier field geologists in the Pacific Northwest.

http://www.youtube.com/profile?user=DustyFingers5#p/a/u/0/Rr8b_GJ2LJo

Zeolites in Washington video

Check me out in a pith helmet! In this video, we banged on the walls at Robertson Pit outside Shelton and also the "Lucky Strike" pit near the Kamilche casino. After that I visited Rudy Tschernich at the Rice Museum in Hillsboro, Oregon, and viewed his world-class zeolite collection.

http://www.youtube.com/profile?user=DustyFingers5#p/a/u/1/5OqQqLj-WYg

Thursday, April 15, 2010

New video - Beverly Beach

On the day the tsunami hit the Oregon coast, we were down at Beverly Beach searching for fossils and other treasures. Here's the report:

http://www.youtube.com/watch?v=Uu1GW4vc-5g

Enjoy!

Thursday, January 14, 2010

Last video for 2009 - Ellensburg Blue Agate

Thanks to another big assist from Dusty Fingers Productions, the final edition of "Garret's World of Geology" for 2009 is ready for viewing on YouTube. We went back to Williams Creek Campground, near Liberty, Washington, which is a great staging area for the trek up to Red Top and a drive over to the Rock 'n Tomahawk Ranch, an easy fee-dig area. We combined both onto one video, tossed in the relevant geology, and voila!

Our special guest was Jake Riley, who came home on leave from Iraq and was rewarded with the biggest agate.

Here's the URL:

http://www.youtube.com/watch?v=wszbP6xQXsM