Discovery of the Mountain Pass REO Deposit
May 2001 by Edgar B. Heylmun, PhDHow does one go about discovering a rare earth oxide (REO) deposit when he is not familiar with the rare and unusual rocks and minerals that are found in such deposits? That was the case at Mountain Pass, California, yet the deposit was eventually discovered and mined.
The pile up on the small hill had to be a couple yards of black sand. I’m not one to ignore a little gold even if it is small in size—I have always believed that gold fever comes in all sizes.
Virginia Elvira Russell
(Mining Grandma of Humbug)
March 4, 1999
I know big mining companies use cyanide and other leach systems to recover gold from ore. Is this the only economically feasible way to recover the values?
by Ronald F. Balazik
Excerpted from USGS Mineral Industry Survey's 1998 Annual Review
The Bawl Mill • Original Sixteen to One Goes to Court—Challenges MSHA Citations Part II • The Golden Triangle of Sonora, Mexico • Using Legal Subdivision • Placer vs. Lode Gold • Gold Tellurides: Tellurium, an Assay Impurity • Court Hears Arguments Over Rights to Shipwreck • Picks & Pans: How to Succeed in a Small Mine, A Case History: 1990-2000 • Charcoal Crucible Recipe • Romance of the Old Silver King • Record-Breaking Alaskan Nugget for Sale • Company Notes • Nevada Gold Production Up Despite Lower Prices • Gold in Guatemala • Bush Taps Utah Resident for Labor Post • Looking Back • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices • Honda Pares Down Use of Precious Metals in Autos