College Inspector is the work of a group of Thai students in Bangkok, using info from the US Department of Education, Postsecondary Education Data System (IPEDS). Qualifications for graphic design programs may vary widely. Learn about commercial art specializations, such as website design, 3D animation, interior design, and video game development. Generally, mining is either done from the surface or underground. Surface mining requires the stripping of surface vegetation, dirt, and if necessary, layers of bedrock in order to reach buried ore deposits. Additionally, explosives may be called for in order to facilitate breakage. Hard minerals such as limestone, sand, gravel, and slate are generally quarried into a series of benches. Strip mining, on the other hand, is more appropriate for softer minerals such as clays and phosphate. In-situ mining can be done from the surface using dissolving agents, retrieving the ore via pumps. Finally, hydraulic jets may be utilized to wash away the overburden or to clear out the ore itself.