Source
Porphyry copper deposits of the world — database and grade and tonnage models
Donald A. Singer, Vladimir I. Berger & Barry C. Moring (2008). Porphyry copper deposits of the world — database and grade and tonnage models. U.S. Geological Survey. Version Open-File Report 2008-1155. https://doi.org/10.3133/ofr20081155 Retrieved 2026-09-07.
- Authority tier
- Primary authority
- Type
- dataset
- DOI
- 10.3133/ofr20081155
- Licence
- Public domain (work of the U.S. Government); the metadata states Access_Constraints: none and Use_Constraints: none
- Retrieved by Lithoen
- 2026-09-07
- Last re-checked
- 2026-09-07 (verified)
Known metadata gaps
Recorded explicitly rather than guessed.
- Horizontal_Positional_Accuracy_Report: the metadata contains none. Positional accuracy is therefore unstated, and Lithoen records the precision the compiler AUTHORED (degrees, minutes and where present seconds) instead of inventing an accuracy figure.