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.
The most commonly mined conflict minerals are cassiterite (for tin), wolframite (for tungsten), coltan (for tantalum), and gold ore, which are extracted from the Eastern Congo, and passed through a variety of intermediaries before being purchased by multinational electronics companies.ther conflict minerals being illicitly exported from the Congo include cobalt, tungsten, cassiterite, and coltan (which provides the tantalum for mobile phones, and is also said to be directly sustaining the conflict).