TY  - RPRT
TI  - Fractal lognormal percentage assessment of porphyry copper resources
AU  - R. A. Crovelli
AU  - S. B. Suslick
AU  - Donald A. Singer
AU  - R.H. Balay
PY  - 1995
UR  - https://pubs.usgs.gov/publication/70197273
ID  - 70197273
ER  -