Gold in Sonora
December 1999 by Edgar B. Heylmun, PhDThe state of Sonora, slightly smaller in area than Utah, lies in-northwestern Mexico, adjoining Arizona to the south. It is characterized, on the east, by a high volcanic plateau, the Sierra Madre Occidental, which forms its boundary with Chihuahua.
The state of Washington may have undiscovered oil and gas resources, especially since drilling to date has been clustered in just a few areas.
The big interest to prospectors thinking about the effect of erosion is not what might happen long into the future, but what they might find in the rivers later this summer when the water levels go down.
Options for affordable crushers for small mining operations
Our December issue is when we take a look backward at the year nearing completion, and this year is no exception. When we do look backward over the past eleven months, all we can say is, “What a year this has been!” And that isn’t meant in a positive...
Trinity County is located in the far northwest corner of California and stirs up many different memories for those who have been there.
• Assembly Bill 1032
• Cache County v. USFS
• CMA appeals cyanide ban
Although it is now known that Mount Diablo, located in Contra Costa County in the East Bay region of the San Francisco Bay Area, was the site of the largest coal mining operation in the state during the last half of the 19th century... this majestic focal point... also was the source of other minerals.
The Bawl Mill • Over the Divide • Our Readers Say • Desert Phone Trashed • ICMJ Elected Prospecting Magazine of 1999 • Advertising Manager Leaving ICMJ • Guest Editorial—California "Special" Dredge Permits in Jeopardy • The Search Continues • Guest Editorial: U.S. Government—Like Nobody's Business • Circulation and Collections Manager Leaving ICMJ • Company Notes • House Chair Requests Records on Forest Decision • BLM Wants to Withdraw South Pass Public Land • Silverton Preserving Lofty Symbol of Mining Era • Hijackers Make Off With 660 Pounds of Gold • Prospecting With a Magnetometer • 1999 Tables of Content • Lighting the Way Underground 1860-1940s • Millie's Tailings • Picks & Pans: Crevicing & Sniping for Placer Gold • Looking Back • Forest Service Boss Quits in Bull Trout Flap • Melman on Gold & Silver • European Gold Miners Seek Clarification Letter • Mining Stock Quotes and Mineral & Metal Prices • Squeezing Diamond Into Graphite