WorldWide Drilling Resource

Frequently-Used Geological Terms Part 53 Glossary Adapted from the Dictionary of Geological Terms M Mining - The process of extracting deposits from the earth. Mining Engineering - The planning and designing of mines taking into account economic, technical, and geological factors. Mining Geology - The study of the geological aspects of mineral deposits, with particular regard to problems associated with mining. Miocene - An epoch of the early Tertiary period, after the Oligocene and before the Pliocene. Mixed-Base Crude - A crude oil in which both paraffinic and naphthenic hydrocarbons are present in approximately equal proportion. Mixed-Layer Mineral - A mineral whose structure consists of alternating layers of clay minerals and/or mica minerals such as chlorite, made up of alternating biotite and brucite sheets. Mohole - A proposed borehole to penetrate into the earth’s mantle below the Mohorovičić Discontinuity . Mohorovičić Discontinuity - The boundary surface separating the earth’s crust from the subjacent mantle. Its depth ranges from about 3-6 miles beneath the ocean floor, to about 21 miles below the continents. It may reach more than 35 miles under some mountain ranges. It is named in honor of Croatian Seismologist, Andrija Mohorovičić. Mohs Scale - A standard of ten minerals by which the hardness of a mineral is rated. The scale runs from softest (1) to hardest (10). 1. Talc 2. Gypsum 3. Calcite 4. Fluorite 5. Apatite 6. Orthoclase 7. Quartz 8. Topaz 9. Corundum 10. Diamond Mollisol - An order of soil which forms under grass in arid climates. They are dark- colored soils with relatively high cation- exchange capacity dominated by calcium. The Mohorovičić Discontinuity, named for Andrija Mohorovičić, was the second major bound- ary to be discovered below the earth’s surface using seismology. Look for more terms next month! Seminars - Thursday and Saturday Over 15 hours of CEUs available Sessions on Drilling, Pumps, Water Treatment, and more. Sessions for REHS Trade Show – Friday Over 25,000 sq ft of Showroom Space 75 Booths (76% Filled as of March 15) 8 Rig Spaces (88% Filled as of March 15) Product Spotlight Demonstrations Lunch on the Showroom Floor Golf Tournament – Thursday Lakeridge Golf Course Awards Banquet – Friday Gaming Tournaments Thursday and Saturday Call the CGA Of:ce (707) 578-4408 for Details. www.groundh2o.org Make Business a Pleasure… …and Pleasure Your Business Silent Auction 49 WorldWide Drilling Resource ® AUGUST 2016