economic geology
Petroleum Geology
Petroleum geology is a branch of economic geology that studies the origin, migration and accumulation of oil and gas, particularly with respect to the discovery of economic occurrences.
GEOMOLOGY
Gemology or gemmology is the science dealing with natural and artificial gemstone materials. It is a geoscience and a branch of mineralogy. Some jewelers are academically trained gemologists and are qualified to identify and evaluate gems.
mining geology
Mining geology is an applied science which combines the principles of economic geology and mining engineering to the development of a defined mineral resource. Mining geologists and engineers work to develop an identified ore deposit to economically extract the ore.
ore geology
An ore is a natural occurrence of rock or sediment which contains enough minerals with economically important elements, typically metals, that can be extracted from the deposit economically. The ores are extracted by mining for a profit from the earth; they are then refined (often by smelting) in order to extract the valuable elements.
coal geology
Coal is the most abundant fossil fuel resource currently used in the world and is expected to be a vital component of the world’s energy resources for the foreseeable future.