Base Metals and Copper Porphyry Deposits

True (A)

Hypogene and Epigenetic

<p>intrusive igneous rocks</p> Signup and view all the answers

<p>Sulfides = CuFeS2 Oxides = Cu2O Carbonates = Cu2CO3(OH)2 Sulfates = CuSO4*5H2O</p> Signup and view all the answers

<p>Open-pit mining (D)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Copper, Lead, Zinc, Tin, Molybdenum</p> Signup and view all the answers

<p>Propylitic alteration zone</p> Signup and view all the answers

<p>Point C, in the footwall of the fault (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>volcanism-related</p> Signup and view all the answers

<p>Quartz-kaolinite-pyrophyllite = Propylitic alteration K-feldspar-biotite-chalcopyrite = Potassic alteration Sericite-chlorite-pyrite = Phyllic alteration</p> Signup and view all the answers

<p>Temperature and pressure gradients, biology, chemistry of country rock</p> Signup and view all the answers

<p>Faults and fissures (A)</p> Signup and view all the answers

<p>Drusy, comb structures, crustiform banding</p> Signup and view all the answers

<p>They are formed by the erosion of underlying deposits, exposing the enriched zones. (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Hypogene deposit</p> Signup and view all the answers

<p>leach cap</p> Signup and view all the answers

<p>Chalcopyrite = Hypogene Chalcocite = Supergene Malachite = Supergene Bornite = Hypogene</p> Signup and view all the answers

<p>They have very high grades of precious metals. (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Accessibility, Economic viability, Environmental concerns</p> Signup and view all the answers

Metals with industrial uses, not precious like gold or silver, including copper, lead, zinc, tin, and molybdenum.

Large, low grade copper deposits formed by igneous intrusions and hydrothermal processes, primarily found in Arizona.

Geological event (75-55 million years ago) responsible for the formation of many porphyry deposits in Arizona.

Refers to ore deposition occurring after the host rock has formed.

Primary mineral deposits formed deep in the Earth, related to cooling magmas.

Processes involving hot water and solutions that lead to mineral alteration and deposition.

Layer in a mineral deposit formed by the breakdown of minerals at surface due to weathering and leaching.

Specific areas within a hydrothermal system where different minerals occur due to fluid influence.

A type of copper deposit formed in volcanic rocks with hydrothermal alteration.

An area where the original mineralogy has changed due to hydrothermal processes.

A geological formation involving extension and normal faults in a region.

Mineral deposits formed from shallow, low temperature hydrothermal activity.

The movement of heated fluids that alters rock and deposits minerals.

Mineralized veins characterized by small crystals formed in cavities.

Cracks in the earth's crust that allow fluid movement, aiding mineral transport.

Variations in temperature and pressure affecting fluid movement and mineral solubility.

Deposits found near hot springs, rich in mercury, arsenic, and sulfides.

A process that concentrates metals at the surface due to weathering and oxidation.

Original high-temperature mineral deposits formed deep underground.

A type of deposit formed at great depths, often rich in copper.

Area where copper has been stripped through the supergene process.

Minerals formed from oxidation of copper-bearing sulfides during supergene processes.

Chemical process where pyrite breaks down, contributing to supergene enrichment.