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| Magazine |
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A place where explosive materials are stored.
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| Magnetic gradient survey |
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Geophysical survey using two magnetometers a fixed distance apart to measure the difference in magnetic field between them.
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| Magnetic separation |
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Mineral processing technique where a magnetic mineral is separated from gangue minerals by applying a strong magnetic field. Common in the treatment of ores of iron.
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| Magnetic survey |
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Geophysical survey that measures the intensity of the Earth's magnetic field.
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| Magnetic susceptibility |
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A measure of the degree to which a rock is attracted to a magnet.
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| Magnetite |
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Magnetic iron ore, being a black iron oxide containing 72.4% iron when pure.
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| Magnetometer |
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An instrument used to measure the magnetic attraction of underlying rocks.
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| Manifold |
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A fluid conductor which provides multiple connection ports.
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| Manual control |
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A control actuated by the operator, regardless of the means of actuation. Example: Lever or foot pedal control for directional valves.
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| Manual override |
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A means of manually actuating an automatically-controlled device.
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| Marble |
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A metamorphic rock derived from the re-crystallization of limestone by the application of heat and pressure.
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| Marginal deposit |
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An orebody of minimal profitability.
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| Massive ore |
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Ore consisting of minerals in almost solid form with very little waste rock (gangue).
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| Material balance |
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A relationship, often portrayed in a diagram, that shows how all components of a raw material are allocated and used.
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| Matrix |
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The rock or gangue material containing ore minerals.
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| Matte |
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A product of a smelter, containing metal and some sulphur which must be refined further to obtain pure metal.
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| Mechanical control |
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Any control actuated by linkages, gears, screws, cams or other mechanical elements.
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| Mercury |
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A silvery metal that is a liquid at room temperature. The principal ore mineral of mercury cinnabar.
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| Mesh |
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Openings in a sieve or screen.
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| Metallurgical coal |
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Coal used to make steel.
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| Metallurgy |
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The science of ore processing, metal extraction and metals.
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| Meter |
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To regulate the amount or rate of fluid flow.
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| Meter-in |
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To regulate the amount of fluid flow into an actuator or system.
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| Meter-out |
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To regulate the flow of the discharge fluid from an actuator or system.
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| Methane |
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A potentially explosive gas formed naturally from the decay of vegetative matter. Frequently encountered in underground coal mining operations.
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| Methane monitor |
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An electronic instrument that detects and measures the methane content of mine air. Provides an early warning if dangerous concentrations are reached.
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| Metre (m) |
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The metric basic unit for linear measurement equal to 39.37 inches (1.094 yards).
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| Micron |
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One-millionth of a metre or approximately .00004 inch.
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| Micron rating |
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The size of the particles a filter will remove.
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| Mile (mi) |
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A unit of linear measurement on land, equivalent to 5,280 feet (1,760 yd) or 1.6 kilometres.
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| Mill |
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A plant in which ore is treated for the recovery of valuable metals, or the concentration of valuable minerals for shipment to a smelter or refinery. Also refers to a revolving drum used in the fine grinding of ores.
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| Milligrams in a Kilogram (mg/kg) |
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Units of concentration. This measure is the same as parts per million (ppm). 1 mg/kg = 1 ppm
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| Millimetre (mm) |
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A unit of length equal to one thousandth of a metre (0.0394 inches).
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| Milling ore |
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Ore that contains enough valuable minerals to be treated
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| Miner |
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Someone who extracts ore, coal, precious substances, or other natural materials from the earth's crust.
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| Mineral |
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Naturally occurring homogeneous substance that has a definite uniform chemical composition and characteristic crystalline structure.
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| Misfire |
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Complete or partial failure of a blasting cap or charge to explode as planned.
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| Modulate |
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To control within an infinite range between 0 percent and 100 percent as opposed to on/off control.
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| Monitor |
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Screen on which an electronics systems display information.
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| Mother lode |
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Any major ore vein running through a region.
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| Motor |
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A device which converts electricity or hydraulic fluid power into mechanical force and motion. It usually provides rotary mechanical motion.
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| Muck |
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Ore or rock that has been broken by blasting.
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