Mineral is a natural resource which mineral formation process takes millions of years and its main properties are not renewable. Minerals can be used as raw materials in industry / production. In such case, the mineral known as minerals.
How important position in the Indonesian mining materials, then through Government Regulation No. 27, 1980, the Government of the Republic of Indonesia divide minerals into 3 groups:
- Materials strategic minerals is also known as minerals group A consists of: petroleum, liquid wax bitumer frozen, natural gas, solid bitumer, anthracite, coal, lignite, uranium radium, thorium other radioactive minerals,
- Excavation material vital minerals also referred to as group B. consisting of: iron, manganese, molobdem, chromium, tungsten, fanadium, titan, bauxite, copper, lead, zinc, gold, platinum, silver, mercury, arsenic, antimony , bismuth, irium, rhutenierium, and other rare metals, beryllium, corundum, zircon, quartz crystal, cryolite, barite, iodine, bromine, chlorine, sulfur.
- Excavation material non-strategic and non-vital, also referred to as minerals group C consists of nitrate, niotrit, phosphates, rock salt (halite), asbestos, talc, mica, graphite, magnesite, yarosit, leusit, alum (alum) , ocher, gemstones, semi gem stones, quartz sand kaolin, feldspar, gypsum, bentonite, diatomaceous earth, absorbent soil, pumice, trass, obsidian, marble, limestone dolomite, calcite, granite, andesin, basalt, trakit, soil clay, sand, provided they do not contain elements mineral class A or class B mineal in a meaningful scale in terms of the mining economy.
Extractive industries largely included in the excavated materials category C, although most of the minerals included in other classes. The geology minerals industry including all three types of rocks that exist in nature is found in igneous rocks. Sedimentary rocks and metamorphic rocks, ranging from Pre-Tertiary to Quaternary age.
No other natural building materials are excavated materials industry engineering untouched. Therefore, with the rapid advancement of engineering it is possible that the type of extractive industries will grow its kind.
Extractive industries are closely linked with everyday human life, it can even be said that human life can not be separated from the extractive industries.
Almost all household appliances, building physical, medicine, cosmetics, stationery, glassware, until the creation of art created directly from the mineral processing industry through engineering.
In Indonesia, there are quite a lot of igneous, sedimentary and metamorphic rocks, the Pre Tertiary to Quaternary age. As a result of geological processes that have lasted millions of years the overall produce the kinds and amount of excavated materials industry quite a lot, but in the local-local may have a very limited amount.