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The Boludo Placers, Sonora
November 2004 by Edgar B. Heylmun, PhD
The Boludo placers described here include gravels that have been listed under many different names, including Altar, Golden Triangle, Llanos del Oro, San Francisco, and Trincheras, among others. The placers are on desert flats at the northwest end of Sierra Santa Rosa, about 2,600 feet above sea level. It is in a region of northwest-trending mountain ranges separated by broad desert valleys.The Bawl Mill
- Brother, can you spare a cell phone?
- Houston, we have a drug problem...
Ask the Experts
• Where would I find a map for the Western states on high silica sand deposits?
Diamond Dealer Prevails in Congo
The one he’s rolling around in his fingers is nice—5.23 carats, nearly the size of a marble, pure and white. But the diamond that Alphonse Ngoyi Kasanji is talking about is the big one—the one that got taken away.
Ask The Experts — Could you please write an article explaining core samples?
Q: How about an article on understanding core samples? I am getting emails from mining companies with core sample reports and I am not sure as to what I am reading!
The Bawl Mill
• Do as I say, not as I do...
• By the numbers...
Melman on Gold & Silver
One of the largest conundrums we would point out is the matter of rising interest rates starting to take place in several nations.
Melman on Gold & Silver
Well, the year 2013 is now underway and we have surely entered the “Brave New World” that has followed the election of 2012. From my personal point of view, and I might add, unfortunately, this year and the ones following are beginning to appear that they will turn out to be quite similar to the preceding period.
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The Bawl Mill
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