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- Igneous: Refers to rocks of molten or volcanic origin.
- Impervious: Said of a rock that does not permit the passage of fluids under the pressure conditions ordinarily found in the subsurface.
- Impregnated: Rocks or minerals saturated with some other substance.
- Incline: A rising slope.
- Incrustation: A coating or crust on a rock.
- Indicated value: The preliminary value determined for a placer sample, before it is adjusted or corrected for known variables.
- Infill Drilling: Diamond drilling at shorter intervals between existing holes, used to provide greater geological detail and to help establish reserve estimates.
- Initial Margin: Customers' funds required at the time a futures position is established, or an option is sold, to assure performance of the customer's obligations.
- In-the-Money Option: Call option - if the futures price is above the strike price. Put option - if the futures price is below the strike price.
- Intercept: That portion included between two points in a borehole, as between the point where the hole first encounters a specific rock or mineral body and where the hole enters a different or underlying rock formation.
- Intrinsic Value: The absolute value of the in-the money amount - that is, the amount that would be realized if an in-the-money option were exercised.
- Intrusion: A mass of rock that has been forced into or between other rocks.
- Iridescence: Display of colors by diffraction of light.
