All Articles
Wall-Rock Alteration
April 2004 by Edgar B. Heylmun, PhD
Wall-rock (country rock) alteration is found in all hard-rock mining districts and has been caused by hydrothermal solutions in the past history of the region. The zones of alteration have a bearing on where one might drill for ore bodies. The weekend prospector does not have the tools nor knowledge to block out ore deposits, but he can narrow down his search dramatically by understanding the zones of wall-rock alteration that he sees.Retired Geologist Warned Public of Pending EPA Disaster

Legislative and Regulatory Update
• New California suction gold dredging regulations released—and they are just as bad as we predicted
• Dredgers file US Supreme Court response in Oregon case
• Washington State pushes same suction gold dredging narrative
• Pentagon reverses decision on rare earth projects
PGMs in California

Legislative and Regulatory Update
• Changes to influential House committees
• Supreme Court may review ESA
• Suit filed to block Kensington
• Exploration incentive proposed in Wyoming
• Montana bill LC1058
Legislative and Regulatory Update
• Additional access restrictions proposed in Arizona
• Oregon senators introduce bill to place state rivers and streams off-limits
Ask The Experts—What Should I Do Next With This Quartz Vein?

Subscription Required:
The Bawl Mill
• Our Readers Say
• Wyoming—A Land That Time (And Explorationists) Forgot
• Two Arrested in Alleged Mining Investment Scheme
• Melman Reports From PDAC—News About India, China, and a Potential Shortage of Nickel
• Picks & Pans: Family's Identity Forged Working Nevada's Gold
• Researching Suitable Areas to Detect for Free-Milling Gold
• A Working Arrastra
• Training Videos From NIOSH
• The Golden Highway—Amador County
• Prospectores Unite in Washington State
• Flexible Circuits Possible From Gold Wire
• Looking Back
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices