Selenite (mineral) was filled with mineral-rich water that drove the crystals' growth. The largest of those crystals weighs 55 tons, is long, and is over 500,000 years old. Gypsum occurs on every continent and is the most common of all the sulfate minerals. Gypsum is formed as an evaporative mineral, frequently found in alkaline lake muds, clay beds, evaporated seas, salt flats, salt springs, and caves. It is frequently found in conjunction with other minerals such as, copper ores, sulfur and sulfides, silver, iron ores, coal, calcite, dolomite, limestone, and opal. Gypsum has been dated to almost every geologic age since the
Oregon Department of Geology and Mineral Industries a Vegetation Permit. Revegetation will be evaluated after one growing season. Vegetation Permit An operator may request a Vegetation Permit upon completion of all required mine reclamation. An Exploration Permit is required for operations that disturb more than one surface acre or involves drilling to greater than 50 feet. Upon receipt of a complete exploration application, a permit will be issued, generally within 30 days. To obtain a permit to drill an oil or gas well, the following items must be submitted to the Department of Geology's Mineral Land Regulation & Reclamation office: The application is reviewed for completeness and