O
Orien
Guest
Does all black sand contain gold? I am asking mainly about black sand found on the bank of a lake.
Chris
Chris
Upvote
0
Chris in BC
Full Member
- Mar 19, 2003
- 155
- 38
- Detector(s) used
-
Minelab X-Terra 705
Keene 5" dredge
- Primary Interest:
- All Treasure Hunting
Nope, just a good indicator is all, not as heavy as gold but close as anything that nature provides, Chris
Bill
Full Member
Black sand and gold.
You don't always find gold with black sand, but you will almost always find black sand with gold. Another good indication that gold might be present, is the desert Trumpet Plant. Again, you don't always find gold where there are Trumpet Plants, but most times you will find Trumpet Plants where there is some gold.
You don't always find gold with black sand, but you will almost always find black sand with gold. Another good indication that gold might be present, is the desert Trumpet Plant. Again, you don't always find gold where there are Trumpet Plants, but most times you will find Trumpet Plants where there is some gold.
blazen70
Full Member
Bill, what is a Trumpet Plant and what does it look like? -Robert-
Hardpan
Jr. Member
- Mar 20, 2003
- 47
- 7
gritty answer
A lot of black sand contains gold but, is not profitable to process except in large quantities. If you're accumulating back sands from a 6 or 8 inch dredge or large trommel in "commercial quantities". you need to make a small mill. With a cutting torch, cut the baffles out of a used cement mixer and sand smooth. Then pour in about 10 gallons of back sand, add two or three 3" steel balls, add water to near the lip, and run constant for a day or two. Now pour off the excess water. It will be blood red in color. Add new water, and run for one more day. pour off the excess water again, remove the steel balls, add an ounce of mercury, add fresh water to the lip again, and run for a day. The amount of gold that will be in your amalgam will be a mind-blower. The gold may then be recovered by retort or acidation methods. Nuff Said, Hardpan
A lot of black sand contains gold but, is not profitable to process except in large quantities. If you're accumulating back sands from a 6 or 8 inch dredge or large trommel in "commercial quantities". you need to make a small mill. With a cutting torch, cut the baffles out of a used cement mixer and sand smooth. Then pour in about 10 gallons of back sand, add two or three 3" steel balls, add water to near the lip, and run constant for a day or two. Now pour off the excess water. It will be blood red in color. Add new water, and run for one more day. pour off the excess water again, remove the steel balls, add an ounce of mercury, add fresh water to the lip again, and run for a day. The amount of gold that will be in your amalgam will be a mind-blower. The gold may then be recovered by retort or acidation methods. Nuff Said, Hardpan
J
jcurts
Guest
- Thread starter
- #6
Charge mercury
Could you discuss with me just a bit this properly charged mercury? What is entailed and what is a proper charge?
We use quite a bit of mercury in big tables but I do not recall the charging part.
Thank you
Jim
Could you discuss with me just a bit this properly charged mercury? What is entailed and what is a proper charge?
We use quite a bit of mercury in big tables but I do not recall the charging part.
Thank you
Jim
Hardpan
Jr. Member
- Mar 20, 2003
- 47
- 7
black sands
For those of you who are obviously new to mining: The milling of black sands is not to be confused with the separation of metals mixed among the sands. The Gold Magic spiral wheel, or any other brand of spiral wheel will not get the majority of the gold which is INSIDE the black sands. It will only pull out the fine gold that is mixed with the sands. The reason to use a mill is to crush the sands and physically separate the gold from inside the sands. At the same time, it cleans away any oxides or other materials which could prevent the gold from amalgamating with the mercury. New, clean, CHARGED mercury is easily purchased at the same price as used, or uncharged mercury.. Often, an equal or greater amount of gold can be milled from sands that have already been spiral wheeled. Nuff said, Hardpan
For those of you who are obviously new to mining: The milling of black sands is not to be confused with the separation of metals mixed among the sands. The Gold Magic spiral wheel, or any other brand of spiral wheel will not get the majority of the gold which is INSIDE the black sands. It will only pull out the fine gold that is mixed with the sands. The reason to use a mill is to crush the sands and physically separate the gold from inside the sands. At the same time, it cleans away any oxides or other materials which could prevent the gold from amalgamating with the mercury. New, clean, CHARGED mercury is easily purchased at the same price as used, or uncharged mercury.. Often, an equal or greater amount of gold can be milled from sands that have already been spiral wheeled. Nuff said, Hardpan
A
Anonymous
Guest
- Thread starter
- #8
Hardpan, your "milling" post contains a lot of truth.
However, it is a misspeak to assume any metallic bearing material can be ground fine enough to release their values.
I regularly mill to minus 200 mesh in order to perform standard wet chemistry testing for my clients.
If all precious (and noble metal ores) were rendered available simply by milling first (known as free-milling) this world would be a lovely place and my job a whole lot easier let alone warp speed faster.
I agree with you that it would never hurt to mill after either using a spiral wheel or amalgamating. However, I wouldn't wholesale mill any blacksands leftovers. I would construct a representative sample, and work with no more than a sample when testing for remaining values using wet chemistry.
Refacing impellers is hard enough, no pun intended
And ballmill balls eventually need replacing as well. Both of these are costly. No need to grind to minus mesh sizes every pan or bucket of black sands left over is my motto.
There does come a point when maintenance costs become a factor in pursuit of values in black sands. I suggest wet chemistry testing of representative samples will mitigate those concerns.
However, it is a misspeak to assume any metallic bearing material can be ground fine enough to release their values.
I regularly mill to minus 200 mesh in order to perform standard wet chemistry testing for my clients.
If all precious (and noble metal ores) were rendered available simply by milling first (known as free-milling) this world would be a lovely place and my job a whole lot easier let alone warp speed faster.
I agree with you that it would never hurt to mill after either using a spiral wheel or amalgamating. However, I wouldn't wholesale mill any blacksands leftovers. I would construct a representative sample, and work with no more than a sample when testing for remaining values using wet chemistry.
Refacing impellers is hard enough, no pun intended
And ballmill balls eventually need replacing as well. Both of these are costly. No need to grind to minus mesh sizes every pan or bucket of black sands left over is my motto.There does come a point when maintenance costs become a factor in pursuit of values in black sands. I suggest wet chemistry testing of representative samples will mitigate those concerns.
Hardpan
Jr. Member
- Mar 20, 2003
- 47
- 7
Black sands
Excuse me Megan, but we are not crushing ORE here, just black SAND. Most black sand concentrates are already 16 mesh or finer to begin with. (mine are) The gold is merely bonded in the magnetite, hematite, limonite, or other iron minerals that make up the black sand. I have even milled dredge concentrates from one location, that was mostly gold coated with manganese. Fact. Simple crushing of the black sand (not ore from a lode) in a home-made mill WILL release 98 percent of it's gold! I even know one guy that would hand grind his black sands up in a meat grinder that was bolted to the table in his garage. Funny, sure, crude too, but it worked.
Again black sands are not ore. Ore comes from a hardrock lode mine. Black sands are the concentrates generated from placer mining. Compositions and hardness are different, ask any mining engineer. Also, it's a safe bet to mill all black sand concentrates that come from New Mexico, Arizona, or California. The rest of the country could be different, I don't know but, down here, it's a given. No testing to do, just recover the gold that's already in your hands or throw it away. Of course it would be fun to play with all those testing chemicals to assay a piece of ORE, if I happened to find one in the area, WHILE I was out placer mining, and recovering gold and black SAND.
I paid $30 for a used cement mixer, and paid a welder another $30 for the ten minutes it took him to take out the baffles with his cutting torch. As far as resurfacing, or replacing the balls; if you're running the daily TONNAGE that it would take to cause that much wear and tear, then you as an individual, must be serious competition to outfits like Phelps-Dodge, Asarco, and Newmont mining corporations. By the way, I bought my balls at a local foundry in Tempe (Marathon Steel) in the early eighties for $1 per pound. They're still rollin'! My ticker will probably wear out before they do. And costly? yes, I guess if you're not willing to give up the price of a round of golf, it could be. I have about $80 invested in my mill that has lasted many years. I'd say it was well spent.
If you'd like, I can post pictures of real gold ore, or of black sand concentrates for you. Best Regards, Hardpan
Excuse me Megan, but we are not crushing ORE here, just black SAND. Most black sand concentrates are already 16 mesh or finer to begin with. (mine are) The gold is merely bonded in the magnetite, hematite, limonite, or other iron minerals that make up the black sand. I have even milled dredge concentrates from one location, that was mostly gold coated with manganese. Fact. Simple crushing of the black sand (not ore from a lode) in a home-made mill WILL release 98 percent of it's gold! I even know one guy that would hand grind his black sands up in a meat grinder that was bolted to the table in his garage. Funny, sure, crude too, but it worked.
Again black sands are not ore. Ore comes from a hardrock lode mine. Black sands are the concentrates generated from placer mining. Compositions and hardness are different, ask any mining engineer. Also, it's a safe bet to mill all black sand concentrates that come from New Mexico, Arizona, or California. The rest of the country could be different, I don't know but, down here, it's a given. No testing to do, just recover the gold that's already in your hands or throw it away. Of course it would be fun to play with all those testing chemicals to assay a piece of ORE, if I happened to find one in the area, WHILE I was out placer mining, and recovering gold and black SAND.
I paid $30 for a used cement mixer, and paid a welder another $30 for the ten minutes it took him to take out the baffles with his cutting torch. As far as resurfacing, or replacing the balls; if you're running the daily TONNAGE that it would take to cause that much wear and tear, then you as an individual, must be serious competition to outfits like Phelps-Dodge, Asarco, and Newmont mining corporations. By the way, I bought my balls at a local foundry in Tempe (Marathon Steel) in the early eighties for $1 per pound. They're still rollin'! My ticker will probably wear out before they do. And costly? yes, I guess if you're not willing to give up the price of a round of golf, it could be. I have about $80 invested in my mill that has lasted many years. I'd say it was well spent.
If you'd like, I can post pictures of real gold ore, or of black sand concentrates for you. Best Regards, Hardpan
A
Anonymous
Guest
- Thread starter
- #10
she's a woman hardpan....you cant teach her anything...she already knows it all :lol:
A
Anonymous
Guest
- Thread starter
- #11
There seems to be some confusion regarding the usage of the term: "ore"
AZ Dave, this one is for you and for Hardpan
Therefore, I would suggest AZDAVE convince the dead Merriam and the dead Webster they erred when giving the two accepted definitions of the noun, "ore." Then, I'll fall in line...behind them apologizing profusely for their error from their respective graves.
JCurts, allow me? IF the "source from which you are striving to extract 'valuable matter' happens to be a quantity of blacksands," I trust you will consider following lab ore sampling protocol described in my earlier post.
Good Luck
AZ Dave, this one is for you and for Hardpan
Therefore, I would suggest AZDAVE convince the dead Merriam and the dead Webster they erred when giving the two accepted definitions of the noun, "ore." Then, I'll fall in line...behind them apologizing profusely for their error from their respective graves.
JCurts, allow me? IF the "source from which you are striving to extract 'valuable matter' happens to be a quantity of blacksands," I trust you will consider following lab ore sampling protocol described in my earlier post.
Good Luck
J
jcurts
Guest
- Thread starter
- #13
This black sand thingy
Gee, boys and girls, I feel a bit edgy in the middle of all this. I just asked to discuss this charged mercury thing and got some answers. I respect every answer that is not a pure BS thing.
I'm not new to mining but have been away from serious mining for about 30 years and just giving this recreational thing a shot although I do have a piece of ground off East of here that will put me on easy street before long. And I wouldn't spoof you a half ounce either.
For some reason this charging thing bounced plumb off me even though I saw it used in large quantities and have even entered the contests to see who could get the farthest with a half a flash of mercury in a pack sack. That one makes the jumping frogs seem like good actors. You want to be real sober and real patient for the event.
The gold they used mercury on was not even the fine stuff we see nowdays and squabble over but tables must have paid their way.
I have spent a few afternoons with morter and pestle out on a hillside so am cognizant of that issue. Packed a quite efficient field qualitative analysis kit copied out of the book " Identification and Qualitative Chemical Anlalysis of Minerals." Great little pack around unit and answered most questions involving anything folks wanted to know about prospective ore.
My life would be easier in some respects if I still had that kit.
Well, take care, and don't go to hard on each other.
Jcurts (Old Clunker)
Gee, boys and girls, I feel a bit edgy in the middle of all this. I just asked to discuss this charged mercury thing and got some answers. I respect every answer that is not a pure BS thing.
I'm not new to mining but have been away from serious mining for about 30 years and just giving this recreational thing a shot although I do have a piece of ground off East of here that will put me on easy street before long. And I wouldn't spoof you a half ounce either.
For some reason this charging thing bounced plumb off me even though I saw it used in large quantities and have even entered the contests to see who could get the farthest with a half a flash of mercury in a pack sack. That one makes the jumping frogs seem like good actors. You want to be real sober and real patient for the event.
The gold they used mercury on was not even the fine stuff we see nowdays and squabble over but tables must have paid their way.
I have spent a few afternoons with morter and pestle out on a hillside so am cognizant of that issue. Packed a quite efficient field qualitative analysis kit copied out of the book " Identification and Qualitative Chemical Anlalysis of Minerals." Great little pack around unit and answered most questions involving anything folks wanted to know about prospective ore.
My life would be easier in some respects if I still had that kit.
Well, take care, and don't go to hard on each other.
Jcurts (Old Clunker)
coinshooter
Bronze Member
That black sand part sounds pretty cool, I have saved mine for many years just to one day go through it. Once it is crushed up will it work just running it through an electric mini sluice or a gold magic, or do you need to actually use Hg on it to get it out from being mixed in with the sand?
I am very hesitant to use Hg since it is a dangerous Neurotoxin and cannot be smelled or tasted. I'd just as soon leave this part alone. I know people who burn it off to leave the gold on a windy day, but I figure they are just polluting their back 40 with Mercury that will eventually get into their food, water, pets, etc. So,..... can I just pan it after I crush it?
Oh, by the way, no thanks Megan, I don't need your advice, any other will suffice. wink
I am very hesitant to use Hg since it is a dangerous Neurotoxin and cannot be smelled or tasted. I'd just as soon leave this part alone. I know people who burn it off to leave the gold on a windy day, but I figure they are just polluting their back 40 with Mercury that will eventually get into their food, water, pets, etc. So,..... can I just pan it after I crush it?
Oh, by the way, no thanks Megan, I don't need your advice, any other will suffice. wink
Dave (Pa)
Jr. Member
Coinshooter' I would think another way would be to disove it out in acid then filter and drop it out of the acid.
coinshooter
Bronze Member
Yeah, maybe, but I am trying to avoid as many harsh chemicals as I can. I work with these things all day long, and don't really want them at my property too. Can't do it at work though. Just thought a water method would be nice.
Hoser John
Gold Member
Jcurts,I still have my copies of Dukes QA-is yours gone?/ Hogan outta New Mexico used to be the last source,outta print for many years.BEST darn book ever for all metals analysis in the field or home.I could run a copy of some au & pt. groups??Tons a au 2 U2-John
Fred
Full Member
LOL That fellow was no fool. Hats off to him. Fred
Hoser John
Gold Member
One of the best,cheapest,and safest oxidizers(glasses prefered) is good old cheap bleach-sodium hypochlorite. Cleans the black sands real good for mercury treatment, to clean up dirty nuggets,or just check black sands for residual gold. Tons a au 2 u all-John
coinshooter
Bronze Member
John,
Tell me more, I have a 2 gallon jug at home full of black sand with gold in it. How is bleach going to help?
Tell me more, I have a 2 gallon jug at home full of black sand with gold in it. How is bleach going to help?
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