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Hillside placers

Gravel deposits where bedrock is higher than the surrounding areas and the deposit is generally not prone to benching, usually a dry placer

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High Grading

Sections of ore which contain high economic concentrations of target minerals

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High grade

Sections of ore which contain high economic concentrations of target minerals

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Hypogene

A geologic process occurring inside or below the Earth’s crust

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Hematite

An common oxide of iron, and form of iron ore, which takes a high polish and is frequently in gemstones and jewelry

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Hyalo

A prefix describing a glassy characteristic

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Heavy metals

A group of metals from copper to bismuth on the periodic table of elements, or any element with a specific gravity of 4 or more