Geological Contact

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Contact, Geological


the contact surface of rocks that form contiguous sections of the earth’s crust. Geological contacts are classified as normal, or stratigraphic, when sedimentary or effusive rock is deposited on older rock; intrusive, if comparatively young intrusive rock has broken through older rock, causing various changes in it; and tectonic, when rocks of different content, origin, and age adjoin along the surface of a tectonic fault.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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The claims are situated along a geological contact trend, previously explored in the 1890's when three short adits were dug out of the hillside.
Preliminary modelling of the results of this work suggest that a shallow dipping zone of Yttrium enrichment occurs as a blanket immediately above the high grade Phosphate zone at the faulted geological contact of the Inca Formation (top - Yttrium) and Beetle Creek Formation (bottom - Phosphate).
The 20% Fe level is natural cut-off imposed by the geology as generally the limit of the resource wireframe coincides with the geological contact of the BIF.
We have also added a drill on our 100% owned Timmins Mine property to explore for new mineralisation along the north-east extension of the same geological contact hosting the Rusk Zone.'
The location of the key geological contact between the sedimentary rocks and the monzonite porphyry changes strike from north-west-southeast strike adjacent to the main Buccaneer Porphyry zone to more north-south strike in the area of north-west extensions which is likely due to fault offsets.
The recognition of the geological contact between the intrusive rocks and the sedimentary rocks has important implications for regional prospecting.
Hole BCRC100011 was collared in sediments to drill back into the porphyry, and the geological contact was intersected at approximately 100 metres down the hole (Figure 6).
Figure 2 shows the IP image, illustrating the well defined, geological contact, as well as identifying the position of the Anomaly B Exploration Target* as only a small portion of the newly defined Target Zone.
Diamond core is marked in 1m or to geological contacts and half sawn, half is sampled and the rest retained in core trays.
Dilution management and mining to geological contacts successful.

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