Battle Mountain district (Copper Basin, Elder Creek)
North-central Nevada, Battle Mountain-Eureka trend, United States
PorphyriesAu-Cu
- Type
- Eocene Au (Cu) porphyries
Eocene (42 to 39 Ma) granodiorite porphyry intrusions of Elder Creek, Long Peak, Copper Basin (Snow Gulch, Paiute Canyon, Poorman's Gulch, North Stock, Bailey Day, Vail Canyon stocks) and late dykes, as shallow cupolas of a common chamber. Magmatic-hydrothermal potassic alteration followed by sodic-calcic alteration by an external saline fluid. Tl follows potassium: K alteration adds and lightens it (mean ε205Tl from -3.2 to -3.7), Na-Ca alteration removes it and leaves heavier Tl (-2.1), 203Tl being more mobile; micas are always lighter than the associated K-feldspar (Rader et al., 2023). Indicative coordinates (Battle Mountain).
ε205Tl in ε units (parts per 10,000) Values of the same system
Standard : NIST SRM 997
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.8 ± 1.98 ε | −0.6 / 2.2 ε | 2 | igneous K-feldspar of unaltered granodiorite Mean and standard deviation recalculated from 2 analyses, PC-14 and SG-08; Tl at 0.20 ppm, close to the detection limit. | Rader et al. (2023), New constraints on fluid chemistry and elemental mobility during hyd… |
| −1.53 ± 1.72 ε | −2.9 / 0.4 ε | 3 | igneous mica (phlogopite, annite) of unaltered granodiorite Mean and standard deviation recalculated from 3 analyses, PC-14, SG-01 and SG-08; 0.63 to 1.21 ppm Tl. | Rader et al. (2023), New constraints on fluid chemistry and elemental mobility during hyd… |
| −2.76 ± 1.37 ε | −5 / −1.6 ε | 5 | K-feldspar from weak potassic alteration Mean and standard deviation recalculated from 5 analyses, BD-12, EC-57, PC-06, SG-07 and VC-23; 0.20 to 0.81 ppm Tl. | Rader et al. (2023), New constraints on fluid chemistry and elemental mobility during hyd… |
| −3.85 ± 0.68 ε | −4.8 / −3.2 ε | 4 | mica (phlogopite, annite) from weak potassic alteration Mean and standard deviation recalculated from 4 analyses, BD-05, EC-22, EC-26 and SG-05; 0.56 to 1.56 ppm Tl. | Rader et al. (2023), New constraints on fluid chemistry and elemental mobility during hyd… |
| −3.57 ± 0.8 ε | −5 / −2.4 ε | 9 | K-feldspar from strong potassic alteration (rock and veinlets) Mean and standard deviation recalculated from 9 analyses, CB-04, CB-04-V, CB-13, CB-17, CB-39, EC-07a, EC-27a, EC-52 and EC-57-V; 0.44 to 1.96 ppm Tl, enrichment linked to K addition. | Rader et al. (2023), New constraints on fluid chemistry and elemental mobility during hyd… |
| −4.4 ± 0.4 ε | 1 | phlogopite from strong potassic alteration Single analysis; EC-07; highest Tl content of the study (2.00 ppm). | Rader et al. (2023), New constraints on fluid chemistry and elemental mobility during hyd… | |
| −1.76 ± 0.87 ε | −3.1 / −0.8 ε | 5 | K-feldspar from sodic-calcic alteration (rock and veinlets) Mean and standard deviation recalculated from 5 analyses, CB-41, NS-09, NS-09-V, PC-02 and VC-04; 0.32 to 1.00 ppm Tl; depleted and heavier Tl after K removal. | Rader et al. (2023), New constraints on fluid chemistry and elemental mobility during hyd… |
| −2.8 ± 2.12 ε | −4.3 / −1.3 ε | 2 | mica (annite, phlogopite) from sodic-calcic alteration Mean and standard deviation recalculated from 2 analyses, LP-01 and PC-01; 1.14 and 1.51 ppm Tl. | Rader et al. (2023), New constraints on fluid chemistry and elemental mobility during hyd… |
Deposits of the same type
- Bingham Canyon United States
- Bingham Canyon United States
- Climax United States
- Henderson United States
- Granisle Canada
- Pebble United States
- Cañariaco Peru
- Oruro Department (unspecified origin) Bolivia
Cite this page
IsoFind Atlas (2026). Battle Mountain district (Copper Basin, Elder Creek), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/district-de-battle-mountain-copper-basin-elder-creek/ (accessed 2026-10-15).
@misc{isofind2026battlemountaindistrictcopperb,
title = {Battle Mountain district (Copper Basin, Elder Creek), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/district-de-battle-mountain-copper-basin-elder-creek/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15