All Articles
The Guyana Highlands
October 2004 by Edgar B. Heylmun, PhD
The Guyana Highlands referred to here are a tropical upland area that extends from French Guiana on the east to Colombia on the west, with elevations reaching 9,219 feet. It occupies a vast and remote region between the Orinoco River on the north and the Amazon River on the south. There are mountains, tablelands, mesas, and swamps, largely impassable to those on foot.New Study on the Formation of Nuggets—Part I
Geologists have long realized that the vast majority of gold in typical quartz veins is in the tiny, dust-size range, a lot smaller than the gold nuggets found by placer miners. This is common worldwide in many, many gold districts.
'Outer Space' Diamond Headed for Auction
Black diamonds, also known as carbonado, are extremely rare, and are found naturally only in Brazil and Central Africa. The cosmic origin theory is based on their carbon isotopes and high hydrogen content.
Using Microbes for Mining
An innovative project enlisting bacteria for minerals recovery has drawn praise from researchers as it begins its second phase.
Cyanide-Free Gold Separation
Some ores—mostly those with a high free gold content—are very amenable to gravity concentration. Well oxidized ores containing coarse gold are usually best for non-cyanide processes. Ores with significant sulfide content may require the...
Miners: Plan Ahead for Next Year's Taxes
Many well-equipped prospecting or mining operations, those with adequate, up-to-date equipment, have discovered a secret: Uncle Sam, in the form of our tax laws, is eager to pick-up a portion of the tab for acquiring and modernizing the equipment necessary to operate a successful mining operation business.
Greaterville, Arizona
One of the best-known placer gold localities in southern Arizona is at Greaterville, 45 miles, by road, southeast of downtown Tucson. The site of mile-high Greaterville is in grasslands and oak woodlands, on the east flank of the Santa Rita Mountains.
Legislative and Regulatory Update
• The next step towards implementing the Wildlands Project
• Former timber lobbyist named to oversee Forest Service
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The Bawl Mill
• Update: Forest Service Interim Rule
• VMS Deposits in Central Arizona
• Prospecting with a VLF-Type Gold Detector
• Freegold Ventures' Golden Summit Project
• Picks & Pans: Working the Crevices
• Molybdenum
• 2004 California State Gold Panning Championships
• Company Notes
• Why Environmental Groups Prefer Kerry
• The French Mines of El Boleo
• Looking Back
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
