Eastern Africa minerals and mining tenders

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In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form. Minerals are classified by key chemical constituents; the two dominant systems are the Dana classification and the Strunz classification. Silicate minerals comprise approximately 90% of the Earth's crust. Other important mineral groups include the native elements, sulfides, oxides, halides, carbonates, sulfates, and phosphates. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay. Mining is required to obtain most materials that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory.

East Africa, Eastern Africa, or East of Africa is the eastern subregion of the African continent. In the United Nations Statistics Division scheme of geographic regions, 10-11-(16*) territories make up Eastern Africa: Eastern Africa had an estimated population of 260 million in 2000. This was projected to reach 890 million by 2050, with an average growth rate of 2. 5% per annum. The 2000 population is expected to quintuple over the course of the 21st century, to 1. 6 billion as of 2100 (UN estimates as of 2017). In Ethiopia, there is an estimated population of 102 million as of 2016. The 13 countries are Burundi, Comoros, Djibouti, Ethiopia, Eritrea, Kenya, Rwanda, Seychelles, Somalia, South Sudan, Sudan, Tanzania, and Uganda. East Africa has been the continent's fastest-growing region in recent years.