Ores 301 Theory : Magmatic Deposits: Ni-Cu Sulphides

Jun 28th, 2015
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Formed by liquid Immiscibility of magmatic segregation : 3 different classes : 1. Komatiite Associated (Synvolcanic) a) KPA b) KDA

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Ores 301 Theory Examination Questions Heavily weighted towards Hydrothermal Ore deposits Essay Questions = Choose 3 out of the 5 (involved in detailed descriptions of 3 types of ore deposits) Magmatic Deposits: Ni-Cu SulphidesFormed by liquid Immiscibility of magmatic segregation 3 different classes 1. Komatiite Associated (Synvolcanic)a) KPAb) KDA2. Gabbroic Class - intrusions in cratonic areas a) Intrusive um-m complexesb) Large layered complexes3. Impact crater: Sadbury type (unique)Settings Stratiform: Massive ore grading into disseminated and matrix, found at base of slow, being thin high grade layers Stratibound: Disseminated/blebby sulphides, found within flows, low grade KPAHost rock: 38-45% MgO 50-75% Olivine Ni : Cu = 10-16:1 (high Cu)Small and High Grade 0.5-5Mt with 2-4% NiKambalda NAKDAHost rock: 45-50% MgO, greater 75% Olivine Ni : Cu = 15-30:1 (Low Cu)High grade low Tonnage Forrestania Large Low grade Greater 300 Mt more than 1% NiMt Keith & Honeymoon well Found in the Yilgarn and Pilbara Craton Host rock: Komatiite - provides siderophile & chalcophile elements, heat, plumbing system. KPA: Being thick mafic-UM sequences containing numerous thick Komatiite flows, MgO component decreasing upwards. Tholeiitic basalt makes up HW and FW formation. Sulphidic interflow sediments within pile (chilled basalt, cumulate texture zone, spinifex to brecciated chilled flow top) Deposited in channel flow facies (massive ore) having no inte

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