April 2005 by Edgar B. Heylmun, PhDMost oilfields are found in anticlinal faults, or stratigraphic traps. Oil floats on water, so that it will rise to the highest point possible, above the water. If the porous or fractured sandstone or limestone that contains the oil is overlain by impervious shale, the oil can no longer rise. If the porous bed is arched upward...
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The Bawl Mill • Our Readers Say • Progress Report on Washington State Small-Scale Regulations • Pediments • Bill to Allow Mining of Coeur d'Alene Basin • Dredging Below the Homestake • Looking Back • Picks & Pans: The Glory Hole • Enthusiastic Crowds at PDAC • Fraser Institute Survey Results Rank Best (and Worst) Mining Locales • Small-Scale Prospecting & Mining (A Little History) • Higher Zinc Price Creates Opportunity • Government Appeals Miner Injury Case to Supreme Court • Mining Stock Quotes and Mineral & Metal Prices • Melman on Gold & Silver