All Articles
Prospecting With Color
December 2000 by Edgar B. Heylmun, PhD
Perhaps no one factor has caused more confusion in the search for ore than the attempt to use color as a guide to prospecting. Yet, there is a reason for every color seen in rocks, so it deserves to be noted.
Prospecting With a Magnetometer
Swedes were the first to note variations in the Earth's magnetic field, circa 1640, and they were the first to use the dip needle. They made the first magnetometer in 1870.
ICMJ Visits Sumpter Oregon, Gold Mining Town
October 2023High Country Dredging in Kaufman Creek, Colorado
I opened the front door of my house at 5:00 AM to find it raining hard and water standing in puddles all over the driveway. Just great! It hadn’t rained for 3 weeks, and on the morning we were leaving for a weekend dredging trip, the weather decided to change.
Looking Back
Excerpts from CMJ published 50 years ago this month.
PLP Update
PLP northern director Clark Pearson stated, “Thanks to the U.S. v. Hicks case, the courts have acknowledged that claimholders are owners of land within the National Forest who are exempt.”
Epithermal Ore Deposits Associated With Tertiary Volcanism—And the Feasibility of Metal Detecting for Them
Epithermal ore deposits are common in regions of late volcanic activity, especially areas associated with Miocene and later Pliocene extrusive volcanics that have not been deeply eroded since the ore was deposited. Many are simple fissure veins, but stock-works and ore-pipes are also common.
BC Premier Heralds "Golden Decade" in Forestry and Mining
British Columbia is poised for a “golden decade” in forestry and mining, Premier Gordon Campbell says.
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The Bawl Mill
• Letter to the Editor
• Potaro District, Guyana
• World Gold Council Launches $3 Million Ad Campaign
• Prospecting for Platinum in Wyoming
• Picks & Pans: More Big River Dredging in Northern California
• Epithermal Ore Deposits Associated With Tertiary Volcanism—And the Feasibility of Metal Detecting for Them
• A Changing Diamond Industry Looks to Canada for Growth
• History of Mining—Bradshaw Mountains, AZ—Part II
• Company Notes
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
