Thursday, February 21, 2013

Blacksand concentrate values as reported in USGS Bulletin No.280

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Discoveries »  +  ? Long Live The President GW scriptGOLD!!!2000 year old GOLD.First hunt of 2013 produces multiple colonial silver!!Unreal day!! Relics, and a 13 projectile point cache!!!G W BUTTON DUG 12-5-2012137 hammered silver!Best Long Weekend Ever! Some great Colonial finds, silver, buttons and more!I finally struck GOLD ! 1861 GOLD !1877 Indian Head Penny!!1915 indian 2.5 dollar gold coinREPUBLIC OF TEXAS Star ButtonGOLD COIN...BOOYEAH!!!!This could have been a once in a lifetime hunt! Lots of silver etc.The Roman Eagle soars again! Results 1 to 4 of 4 Thread: Blacksand concentrate values as reported in USGS Bulletin No.280«Prev Thread | Next Thread»LinkBack LinkBack URL LinkBack URLAbout LinkBacks About LinkBacksThread ToolsShow Printable VersionEmail this Page…Subscribe to this Thread… Ignore this ThreadSearch Thread Advanced SearchDisplayLinear Mode Switch to Hybrid Mode Switch to Threaded ModeJan 28, 2013, 02:58 AMOriginal Poster#1specksandflecks specksandflecks is offlinespecksandflecks's AvatarusNov 2009Eugene OregonWhites GMT18 4 times Prospecting Blacksand concentrate values as reported in USGS Bulletin No.280
Thought I would put this out there. I'm sure it's been posted many times before, although a quick site search returned no results. Begins on Page #150.

Bulletin - Google Books

It's my understanding that 95-98% of the values were recovered as free gold/platinum down to 200 mesh using Wilfley type tables, although other means were also apparently used in the assay process.

What I was trying to find when I found this was what amount of gold could potentially be bound to the black/heavy sand concentrates from various areas. Since I have several hundred pounds from several areas I have been thinking more about grinding/roasting,etc to see what values they might hold.

What are the preferred methods for reducing my heavy cons from say #8, down to 2-#300? Ball Mill Vs Roller Vs Impact for example? I have been considering re purposing a used cement mixer into a makeshift mill of some type but was doubtful the values would be worth the time/trouble, Bulletin 280 almost has me re-considering the experiment, almost.
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Jan 28, 2013, 08:06 AM#2russau russau is offlineMay 2005St. Louis, missouri1,970 84 times
youll never know untill you do it! already haveing a cement mixer is a plus for grinding large amount of BS. add some vinigar or something to help wash off any lingering mercury or oils to help in your recovery.
Reply With Quote Reply With Quote Jan 28, 2013, 09:16 AM#3Oakview2 Oakview2 is offlineOakview2's AvatarusFeb 2012Prather CAWhites GMT577 170 times Prospecting
Hard rock sampling mill Without the hard work




Thanks for the help I was lost, let me know what ya think of my setup. The wind is blowin heck today and im stuck at home with the grandson. ( Mining the internet )

good luck n happy hunting Cpt Herb
"The most inspiring thing about gold, is not the value, but under magnification, the true beauty of each piece. They are truly like snowflakes that never melt." Oakview2
Reply With Quote Reply With Quote Jan 28, 2013, 01:49 PMOriginal Poster#4specksandflecks specksandflecks is offlinespecksandflecks's AvatarusNov 2009Eugene OregonWhites GMT18 4 times Prospecting
Thanks Russau, about how much vinegar for a 5 gallon batch?

Thats great Oakview2, I seldom read the hardrock section of the forums, figure I would probably end up down an old mineshaft somewhere. Maybe an occasional looksee wouldn't hurt though!
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