Abstract: Lithogeochemistry of hydrothermally altered host rocks about the Amaranth low sulphidation epithermal gold-bearing quartz vein, Waihi, New Zealand
Bibliographic record
Abstract
The Waihi epithermal vein system is located at the southern end of the Coromandel Peninsula, on the North Island, New Zealand. It is the largest of ~50 known deposits in the Hauraki Goldfield, which hosts a number of producing and past-producing, low sulphidation epithermal goldand silver-bearing quartz veins. Veins presently being mined in the Waihi area are hosted by Miocene to Pliocene volcanic rocks of andesitic to dacitic composition of the Coromandel Group. Two main lithologic host units have been identified in previous studies and consist of a subjacent quartz-plagioclase-porphyritic andesite and superjacent plagioclase-porphyritic andesite; the former generally hosts wider and higher-grade veins. Much of the Waihi area is overlain by younger ignimbrite, tuff, alluvium, and volcanic ash from the currently active Taupo Volcanic Zone to the southwest. The Amaranth Vein, one of several large veins in the Gladstone Hill area of the Waihi gold camp that have yet to be mined, is located just east of the town of Waihi, several hundred metres to the east of the high grade Martha open pit mine, and a few hundred metres to the west of the Favona underground mine. Rocks in the Gladstone Hill area are characterized by strong to intense hydrothermal alteration that is manifested by the presence of abundant clay minerals (muscovite, illite, interlayered illite-smectite, smectite, and chlorite) that have mostly replaced phenocrysts and groundmass. Typical alteration consists of an adularia-dominant assemblage of variable intensity overprinted by sericite and clay in the more extensively altered rocks. A commonly less pervasive propylitic chlorite-calcitedominated alteration assemblage is also locally present. Pyrite and quartz are ubiquitous throughout the area and vein calcite, though prevalent in the nearby Martha deposit, is restricted to relatively isolated zones in the Gladstone Hill area. Alteration zonation is inconsistent with distance to the Amaranth Vein. Alteration intensity estimates based on textural criteria may be correlated with the abundance of pyrite and hydrous minerals, but like the alteration zonation, exhibits little correlation with distance to the vein.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".