Blacksand concentrate values as reported in USGS Bulletin No.280

[specksandflecks]

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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[russau]

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.

 

[Oakview2]

http://www.treasurenet.com/forums/h...ard-rock-sampling-mill-without-hard-work.html




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

 

[specksandflecks]

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!