Strike and Dip Measurement for Rock Bed Orientation

Strike and Dip of Rock Beds

The strike and dip of a rock bed are key concepts in structural geology used to describe the orientation of a rock layer.

Strike

Strike is the direction of the line formed by the intersection of a rock surface with a horizontal plane. It is usually measured as an angle from north, with values ranging from 0° to 360°.

Essentially, strike indicates the compass direction of the rock layer as it extends across the landscape.

Dip

Dip is the angle at which the rock bed inclines from the horizontal plane. It is measured perpendicular to the strike direction and indicates the steepest angle of descent of the rock bed.

The dip has two components: the dip angle (measured in degrees from the horizontal) and the dip direction (the compass direction in which the rock layer is inclined).

Together, strike and dip provide a complete description of the orientation of a rock layer in three-dimensional space.

Mine Surveying Terms

Here are short definitions of the terms related to mine surveying:

Seam

A seam is a layer of mineral or coal that is distinct from surrounding rock layers. It is typically mined for its valuable content.

Borehole

A borehole is a deep, narrow hole drilled into the ground to explore subsurface conditions, extract samples, or access mineral resources.

Drift

A drift is a horizontal or near-horizontal passageway in a mine. It is often used for access, transport, ventilation, or exploration.

Degree of Curve

The degree of curve is a measure used in surveying and railroading to describe the curvature of a path. It represents the angle subtended by a 100-foot arc of the curve.

Gallery

A gallery is an underground passageway in a mine, similar to a drift but often referring to larger, more permanent tunnels used for various mining activities.

Fold

A fold is a bend in rock layers resulting from geological forces. Folds can affect the orientation of mineral seams and are important in geological mapping and mining.

Reserve

A reserve is the portion of a mineral deposit that can be economically mined. It includes both measured and indicated resources that are deemed feasible for extraction.