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people online in the last 1 minutes - 0 members, 0 anon and 0 guests. (Most ever was 29 at 13:36:32 Sat Aug 3 2002)

   
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tvanwhoThanks for the encouragement John
I may go over to Rock Creek this weekend to see a farmer.I want to see why my map dowsing is so extremely attracted to spots on his land even tho there is no known gold in the area. He does have 2 limestone /gravel quarries thereabouts.
I had found a spot in another river nearby, where the dowsing took me in about a mile across really rough ground and the river was a mudhole. But in the 1/4 mile of the river that wasn't all mud, I had found an area that looked like it had seen some mining activity and the river bottom was a coarse reddish bedrock with tons of black hotrocks.Most of these black rocks were lite as pumice but I hit one with the sharp end of my pick and it just bounced off the rock, and flattened the point on my pick? How can a tennis ball size rock be that tough? I hardly even scratched the rock.
A bit farther downsteeam, my rods pointed to a spot and I triangulated best I could.Had to wiggle down a 7 foot vertical river bank. My MXT started showing Hotrock readings everywhere and then I turned around and BANG. My meter went totally blank , dunno why?, but the detector was screaming. I dug down into what looked like a manmade gravel bar ,as all the cobbles looked the same size like a cobblestone street. I dug about 8 inches and a fist size black rock came up, shaped just like my fist too. It was extremely heavy for its size, maybe 2 pounds is my guess. Unfortunately, I got kinda depressed it wasn't yellow, so I chucked it!! Biggest mistake I've made in a long time. I even had a rock pick on me with a super magnet and didn't check it with that. I have been back there 4 times and can't find that rock? I have since read in the last 2 years that some gold nuggets are coated with black oxides of iron or manganese,OOPS !
If that was a gold nugget ,there have got to be more deposits than just that one,hence my interest in a visit to Rock Creek this Sunday. Heck, I will offer to buy some flowers/chicken meat from the farmer and see if he will let me in to prospect for gold? I will be sure to ask if he knows any spots on the creek where there is exposed reddish bedrock and black rocks lying around? I will compare what he says to the spots I map dowsed for gold deposits and see if they match.
At least I will know this time to NOT throw away any heavy rocks that sound off on my MXT. Take em home and do some testing on em first/cut with a rock saw, check specific gravity, etc...I always seem to have to learn things the hard way?

-Tom
aussco999Re: Geowizard,another question?
Hey Tom:

Canít tell you much about metal detectors (Iíve got a Minelab XT18000, but it hasnít seen the light of day in years), but I can pass along some info on galena mining. I worked at a galena mine in northern Arizona for a few years back in the mid 1990ís. At the time, chasing just the galena ore wasnít profitable. Our cons averaged 1400 lbs. of galena/ton, with 180+ oz. of silver, and only a trace of gold. The silver mineral was argentite. The closest refiner for us was located in Trails, Canada. (Yes, we knew about Doe Run, MO, but they wouldnít pay for the silver). At that time, the price of refined Pb was about $0.18/lbs. and Ag was $4.50/oz. If I remember correctly, after shipping and penalties, we lost $10. for every ton of galena shipped. The refiner kept saying we would make it up with more volume. That modern math thing, I guess.

Then by accident, while drilling the hanging wall in several places to check for stability, we ran a few assays and found gold running between 2 and 7 oz/ton. Again, this was back in the days of $265. to $300./oz for gold. The gold was a combination of free gold and associated sulphides. It was cheaper for us to just add 500 to 600 lbs. of hanging wall ore to each ton of galena cons and let the refiner pay us for the gold. The galena vein was about 4í wide, running from the back to the floor, so we were drifting in a 9í wide (plenty of room to maneuver the LHD), and taking 5í of the hanging wall. I ran some of the hanging wall separately and did fairly well, but low overall metal price forced the sale of the mine after a few years. It would be a different story at todayís prices.

Refining galena now days is fairly straightforward, add controlled heat. Heating the ore mix above 832(F) will volatize the sulfur off (re-captured for making acid), the Pb and zinc will be in a molten state. The Parkís process recovers the precious metals with the zinc. Zinc is further purified by distillation, and Pb recovery is in the upper 90%. In a pinch, lead can be extracted from galena over a campfire.

Iím guessing that you are finding a lot of slag because they didnít take the extra step of concentrating the galena, beyond hand cobbing, and just smelted everything coming out of the ground. Hereís the bad news. If the Old-Timers were going after lead and zinc, then they got most of the silver and gold. This is because in pyro-metallurgy order, lead has an affinity for zinc, zinc has an affinity for silver, and silver has an affinity for gold. The only way you would have residual sulfur left in your slag is if the refiner didnít heat the ore up enough. (see above). If thatís the case, there might be some zinc, silver and gold remaining.

The next question would be; at todayís gold prices of +$900. X 0.13 = $117./ton, (assuming a 100% recovery), then do you have enough tonnage available to make a profit. Extracting 0.13 oz. from 2,000 lbs. of slag will take some work. I recommend starting simple (cheap), by taking several grab samples, crush and pulverize to Ė100 mesh or finer, and use any form of gravitational separation. This will tell you several things including, point of liberation, what shape, form and type of heavy metals are collected in the cons. Weighing all the material dry at each step will give you a better idea of your final extraction ratio. Assay the cons and extrapolate the numbers.

When you are done testing the slag, let us know if you are in business. In todayís economy, this project could have some merit.

Good Luck,

John
tvanwhoGeowizard,another question?
I found a spot behind a loose boulder on the relatives land who has the galena. There is some sort of mineral there where the land slopes down to the creek and right behind that there boulder. The stuff is kinda chalky white but has a greenish/blue tinge to it, fairly soft, definitely not metallic.Any idea what it might be? I will try to take a photo of it. Unfortunately, my relative has told the Wisconsin DNR to include his land in their forestry holdings or some such thing so mining is pretty much out of the question. here. Still would be nice to know what this mineral is?

-Tom
tvanwhoSacman...your rock...
I metal detected a chunk of rock similar to that some years ago near Payson,Arizona with my Lobo ST. I eventually found out it was magnetite/hematite . A rock shop offered me 15 bucks for it so it wasn't totally worthless.You can tell by the red splotches on the rock. Find somebody with a rock or tile cuttting saw and saw off a piece where the red shows. It will be like blood red on the inside and you will know for sure it is hematite and if the rest of the insides are metallic looking, it is most likely magnetite. Both Hematite and magnetite are iron ores.
My local college geology dept swore my rock was a meteorite but they were WRONG. I had meteorite hunters tell me that rocks from space do NOT contain Hematite-the red splotches on your rock.

-Tom
jjedwabRe: slag piles and poor farmers
We used here a VOYAGER EDS-attachment to a JEOL Superprobe 733 since 1980 (amazing!), and now, I have no idea about what's going on in that market.

-Try to be free from liquid nitrogen hassle, or be sure to be able to feed the reservoir in all circumstances, vacations, week-ends, disease .
-Be very cautious when choosing the operating system of the EDS computer, which should preferably be the same as that of your office computer(s).
-Speed of mapping for separate elements is also important: too slow acquisitions are nerve-shaking.
-Operating personel should be fully aware of mineralogical and chemical problems, associations, incompatibilities, etc.
-Mastering of the back-scattered electron mode, the most frequent and critical peak-interferences (Pb-Hg/S; K/U; Mo/S, Zr/P...), heavy/light-element electronic properties,

I beg your pardon, I could go on and on, ...and discourage you!

Good luck! J.J.
sac__manRe: slag piles and poor farmers
Thanks Geowizard..
On the streak test it shows dark grey to allmost black ?
it is not magnetic and is quite hard. it reads as Zinc on the MXT. I put a few drops of nitric acid on it and it seems to have no effect ?? Platinum ???? :confused:
gpgRe: slag piles and poor farmers
Let's see if I can get these pics on. Nope.
sac__manRe: slag piles and poor farmers
not trying to high jack this thread but is this what Galena looks like ? I found it with my MXT.






tvanwhoRe: slag piles and poor farmers
I'll make some inquiries in the town next time I am there. My relative showed me some areas he says are slag piles and they are like 30 feet high outside of the one town. They look like yellow mounds to me , not pumice or glassy lookin.I know Hecla and New Jersey Zinc had some operations therabouts in the last 50 years. I'd be after the spots on the Topo maps where it shows the word FURNACE ,usually near a creek. Those are probably the 40% efficient old timer workings.
Who gives the most reliable assays? I used Action Mining in Oregon last time.It cost 30 bucks for gold and silver only.I couldn't afford the 180 bucks to tell me everything that was in the galena sample.

-Tom
mldaveRe: slag piles and poor farmers
Looks like those small pockmarks once held sulphides......

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