Magic -

• Magic - Igneous rocks composed mostly of dark, iron- and magnesium-rich minerals.
• Magma -The molten material deep in the Earth from which rocks are formed.
• Magmatic segregation -An ore-forming process whereby valuable minerals are concentrated by settling out of a cooling magma.
• Magnetic gradient survey-A geophysical survey using a pair of magnetometers a fixed distance apart, to measure the difference in the magnetic field with height above the ground.
• Magnetic separation -A process in which a magnetically susceptible mineral is separated from gangue minerals by applying a strong magnetic field; ores of iron are commonly treated in this way.
• Magnetic susceptibility -A measure of the degree to which a rock is attracted to a magnet.
• Magnetic survey -A geophysical survey that measures the intensity of the Earths magnetic field.
• Magnetite -Black, magnetic iron ore, an iron oxide.
• Magnetometer -An instrument used to measure the magnetic attraction of underlying rocks.
• Map-staking -A form of claim-staking practiced in some jurisdictions whereby claims are staked by drawing lines around the claim on claim maps at a government office.
• Marble -A metamorphic rock derived from the recrystallization of limestone under intense heat and pressure.
• Margin -Cash deposited with a broker as partial payment of the purchase price for any type of listed stock. The stock is held by the broker as security for the loan.
• Marginal deposit -An orebody of minimal profitability.
• Market order -An order to buy or sell at the best price available. In absence of any specified price or limit, an order is considered to be “at the market”.
• Matte -A product of a smelter, containing metal and some sulphur, which must be refined further to obtain pure metal.
• Metallurgical coal -Coal used to make steel.
• Metallurgy -The study of extracting metals from their ores.
• Metamorphic rocks - Rocks which have undergone a change in texture or composition as the result of heat and/or pressure.
• Metamorphism -The process by which the form or structure of rocks is changed by heat and pressure.
• Migmatite -Rock consisting of thin, alternating layers of granite and schist.
• Mill - A plant in which ore is treated and metals are recovered or prepared for smelting; also a revolving drum used for the grinding of ores in preparation for treatment.
• Milling ore - Ore that contains sufficient valuable mineral to be treated by milling process.
• Millivolts -A measure of the voltage of an electric current, specifically, one-thousandth of a volt.
• Minable reserves -Ore reserves that are known to be extractable using a given mining plan.
• Mineral -A naturally occurring homogeneous substance having definite physical properties and chemical composition and, if formed under favorable conditions, a definite crystal form.
• Muck -Ore or rock that has been broken by blasting.
• Muck sample -A representative piece of ore that is taken from a muck pile and then assayed to determine the grade of the pile.

Reserve Calculations using Trapezoidal Methods Reference on Sphalerite Activation Metals Native Elements, Gold Groups and Ismetric Mining Clothing Cadmium Elements, Alloys and Symbols Crusher Reduction Ratio Calculated Mill Power Placer Deposits Sampling a Mineralized Vein Red Flags and Scams Gold Bio-Oxidation Process Alternative Table - Chart to Sizing a Shovel Dipper Permit System and Raising Capital Opal Composition, Crystallization & Structure Crystalline Quartz Varieties