Our Readers Say
January 2001 by StaffConcerning assay comments...
Alluvial fans are essentially dry land “deltas” which can be found in all climates. However, they are best developed in arid and semi-arid regions, where they may be many square miles in area. They are built up by outpourings of silt, sand, and gravel caused by seasonal run-off, as well as by boulders and cobbles carried by flash floods.
In 1717, Sir Isaac Newton, Master of the British Mint, established a fixed price for gold that was equivalent to around US$20.00 per ounce. This price was for bullion gold, refined to a purity of twenty-two karats (.917 fine).
Colorado-Utah-Wyoming oil shale was first reliably discovered to contain gold and silver by the U.S. Bureau of Mines in the 1920s. Although most of this vast shale resource, up to 1,000 feet in thickness, contained nil or barely detectable values, many brown shale samples fire assayed here over the past thirty years have yielded up to 0.02 ounces per ton (opt) Au and 2.0 opt Ag.
Prospectors who specialize in electronic detecting for nuggets in desert areas are especially interested in this type of deposit, as it yields nuggets that are close to the surface of the ground...
Discovering new mines is often associated with reexamining old ones, as several prominent new discoveries will attest in northern Mexico. MAG Silver Corp. is exploring three historic districts.
The Bawl Mill • Over the Divide • Special Editorial: Gold Anti-Trust Action Committee Believes They Have the Evidence • World Gold Council News • Metal Detecting Within the Cordillera for Gold Placers Associated With Tertiary Epithermal Ore Deposits • Picks & Pans: An Exciting Hobby • Prospecting for Silver With a Geiger Counter • The Furnace Atmosphere During the Fire Assay • The Hanging Tree • Gold in Chihuahua, Mexico • ICMJ 10th Annual Photo Contest Results • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices • Looking Back