| Lat / long: | 48.70671, -121.93314 |
| Tertiary: | Arsenic, Chromium, Iron |
| Other material: | Chromite, Enstatite, Magnetite, Olivine, Serpentine |
| Discovery year: | 1934 |
| Operation type: | Surface |
| Development status: | Occurrence |
| MAS | 530730006 |
| DEP | 10204445 |
| Reference | {Deposit:: GAUDETTE, H.E., GEOCHEMISTRY OF THE TWIN SISTERS}{Deposit:: ULTRAMAFIC BODY, WASHINGTON, UNPUB. THESIS, UNIV. OF}{Deposit:: ILLINOIS, 1953.}{Deposit:: WA. DIV. MINES AND GEOL. BULLETIN 37, 1956, PART II,}{Deposit:: VOL. 1, P. 41.}{Deposit:: WA. DIV. MINES AND GEOL. BULLETIN 57, 1969, TABLE 19,}{Deposit:: P. 68.} |
| Reporter | Ridenour, James |