• Mineralogy and petrography (e.g. sulfides vs. oxides in copper).• Chemical composition (primary and secondary minerals).• Deposit structure (folds, faults, discontinuities, intrusions).• Planes of weakness ( joints, fractures, shear zones, cleavage in minerals, cleat in coal).• Uniformity of grade• Alteration and weathered zones.• Existence of strata gases.
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