A medical license is an occupational license that permits a person to legally practice medicine. Most nations require such a license, bestowed either by a specified government-approved professional association or a government agency. Licenses are not granted automatically to all people with medical degrees. A medical school graduate must receive a license to practice medicine to legally be called a physician. The process typically requires testing by a medical board. The medical license is the d
Strip mining is the practice of mining a seam of mineral, by first removing a long strip of overlying soil and rock (the overburden). It is most commonly used to mine coal and lignite (brown coal) . Strip mining is only practical when the ore body to be excavated is relatively near the surface.This type of mining uses some of the largest machines on earth, including bucket-wheel excavators which can move as much as 12,000 cubic meters of earth per hour.trip mining is only practical when the ore body to be excavated is relatively near the surface. This type of mining uses some of the largest machines on earth, including bucket-wheel excavators which can move as much as 12,000 cubic meters of earth per hour.
Common metal-bearing minerals. A mineral deposit is a natural concentration of minerals in the earthâs crust. The degree of concentration is called the grade of a mineral deposit. An ore deposit is a mineral deposit which has high enough grades of metal that makes it economic to mine.ateritic soil with concentrated aluminum ore formed by weathering. 1  The settling out of heavy minerals like sulphides or chromium oxides to the bottom of a chamber of cooling molten magma. 2  Simple weathering of rocks can leave an oxidized soil residue of concentrated metal-minerals.