Creta, Magnum

Oklahoma, USA

Main commodities: Cu
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The Creta copper deposit in south-western Oklahoma is the only example of the extensive Permian and Triassic age sediment hosted copper mineralisation within Kansas, Oklahoma and Texas (USA) to have been mined to date.

Regionally Permian to Triassic sediments are exposed over an area elongated in a generally NNE-SSW direction extending over a strike length of more than 1200 km.   Indications and small occurrences of sediment hosted copper mineralisation are spread over much of this interval.

Creta is located within the Anadarko Basin in southern Oklahoma.   It is hosted by the Permian Flowerpot Formation and is associated with the WNW-ESE trending Wichita basement high where the host overlies Cambrian bimodal igneous rocks.   Mineralisation occurs in shallow marine, pyritic, silty shales within a sequence of sandstone, siltstone and evaporitic rocks deposited in fluvial-deltaic and tidal flat environments.

Production from Creta between 1965 and 1975 totalled around 1.8 Mt @ 2.3% Cu, 5.5 g/t Ag.
The nearby Magnum deposit is believed to have a sub-economic reserve of approximately 3.6 Mt @ 1% Cu.

For detail see the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 1989.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.

  References & Additional Information
   Selected References:
Branam T D, Ripley E M  1990 - Genesis of sediment-hosted Copper mineralization in south-central Kansas: Sulfur/Carbon and Sulfur isotope systematics: in    Econ. Geol.   v85 pp 601-621

Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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