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2. Orogenic gold deposit - Wikipedia

   en.wikipedia.org/wiki/Orogenic_gold_deposit

   A variety of gold deposits are formed in accretionary orogens, including orogenic gold deposits. [38] Orogenic gold deposits are typically located in metamorphosed fore-arc and back-arc regions, as well as in the arc [3] and show a close spatial relationship to lamprophyres and associated felsic porphyry dikes and sills. [39]

3. Gold extraction - Wikipedia

   en.wikipedia.org/wiki/Gold_extraction

   Cyanide leaching "heap" at a gold mining operation near Elko, Nevada. On top of the large mounds of ore, are sprinklers dispensing a solution of cyanide. Gold extraction is the extraction of gold from dilute ores using a combination of chemical processes. Gold mining produces about 3600 tons annually, [1] and another 300 tons is produced from ...

4. List of countries by gold exports - Wikipedia

   en.wikipedia.org/wiki/List_of_countries_by_gold...

   Gold ore exports in world with gold ore in south Africa Ghana , china and USA and Russia ,Eastern Africa Gold exports in 2023 was 443 Dollars in Ethiopia , 223 Million Dollars of fine gold ore in Somaliland of 2 Tons and Uganda 1 Billion dollars in gold ore for exports. The following is a list of countries by gold exports.

5. Colorado Mineral Belt - Wikipedia

   en.wikipedia.org/wiki/Colorado_Mineral_Belt

   The Colorado Mineral Belt (CMB) is an area of ore deposits from the La Plata Mountains in Southwestern Colorado to near the middle of the state at Boulder, Colorado, and from which over 25 million troy ounces (778 t) of gold were extracted beginning in 1858. [2]

6. Leaching (metallurgy) - Wikipedia

   en.wikipedia.org/wiki/Leaching_(metallurgy)

   Leaching is a process widely used in extractive metallurgy where ore is treated with chemicals to convert the valuable metals within the ore, into soluble salts while the impurity remains insoluble. These can then be washed out and processed to give the pure metal; the materials left over are commonly known as tailings.

7. Underground hard-rock mining - Wikipedia

   en.wikipedia.org/wiki/Underground_hard-rock_mining

   There are two principal phases of underground mining: development mining and production mining. Development mining is composed of excavation almost entirely in (non-valuable) waste rock in order to gain access to the orebody. There are six steps in development mining: remove previously blasted material (muck out round), scaling (removing any unstable slabs of rock hanging from the roof and ...

8. Carlin–type gold deposit - Wikipedia

   en.wikipedia.org/wiki/Carlin–type_gold_deposit

   Ore grade is about 0.20 to 0.25 ounces of gold per ton of rock. The gold mineralization is very finely disseminated: "invisible gold". Carlin–type gold deposits are sediment-hosted disseminated gold deposits. These deposits are characterized by invisible (typically microscopic and/or dissolved) gold in arsenic rich pyrite and arsenopyrite. [2]

9. Placer deposit - Wikipedia

   en.wikipedia.org/wiki/Placer_deposit

   Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, aeolian placers and paleo-placers. [2] Placer materials must be both dense and resistant to weathering processes. To ...