... ig . 3. Oblique aerial photograph of the Martha deposit open pit and outline of veins at the Favona deposit, near the Waihi township. Waihi Beach is in the background. Renewed exploration of the underexplored areas near the Silverton, Union, Mascotte, and Amaranth veins (Figs. 4 –6...

...) . Note the possible west-northwest–east-southeast alignment of the deposits versus the northeasterly trends of the main veins. The demagnetized zone defines the total Waihi up-flow system. (B) Cross section of the Waihi vein system. This paper describes the state of structural information...

...Cornel E. J. de Ronde; Peter Blattner Abstract The Golden Cross epithermal gold-silver deposit is located 120 km north of presently active geothermal systems of the Taupo volcanic zone in the Waihi district, Coromandel Peninsula, New Zealand. Gold and silver of economic grades (1-20 g/metric ton...

... quiet zone and the locations of the Waihi and Favona deposits. Preliminary modeling indicates that the anomaly source body, beneath the near-surface, low-density altered andesite, has a volume of up to ~11 km 3 and a minimum density of 2,900 kg m −3 . The nature of this source body is enigmatic...

...F ig . 1. Hauraki goldfield showing geology and distribution of epithermal Au-Ag silver deposits and the location of the Waihi deposit. ...

.... Results for modern Taupo volcanic zone calcites were paired with known fluid δ 18 O values and these indicate precipitation in equilibrium with produced geothermal waters. Measurements carried out at the Waihi low sulfidation deposit in New Zealand, the Antamina polymetallic skarn in Peru, and the Mount...

... Determinations of Adularia from the Paritu, Opitonui, Broken Hills, Wharekirauponga, Maratoto, Sovereign, Waihi, Favona, Karangahake, and Waiorongomai Deposits (all errors are ±2 σ ) AU no. CM Hall no. Location Plateau MSWD F39 (%) Isochron 40/36 Intercept n MSWD Total gas Comments 56756...

... goldfield and Coromandel volcanic zone. C. Regional geology, mineral deposits, and provinces. D. Structural features of the Coromandel volcanic zone and Hauraki goldfield. Black open box in C and D shows location of Waihi-Waitekauri geophysical study area of Morrell et al. (2011) . Figure modified from...

...Fig. 1. Map A the Hauraki goldfield showing the regional geology and distribution of Au-Ag deposits. The insert map shows the location relative to the North Island of New Zealand. Modified from Brathwaite & Faure (2002) . Map B shows the surface geology of the Waihi area, as well...

... of approximately 2,900 km 2 . Approximately 69 percent of the production was from the world-class Martha deposit at Waihi. Some 97 percent of total past gold production was from deposits hosted in Miocene andesite and dacite of the Coromandel Group, although this unit represents only 61 percent of the rocks...

... the Ngauruhoe area at 12–11 ka that resulted in the deposition of the Mangamate Formation ( Nairn et al., 1998 ; Hitchcock and Cole, 2007 ; Stirling et al., 2012 ). Van Dissen et al. (2003) calculated a ≤2 k.y. recurrence interval for surface rupture of the Waihi and Poutu fault zones based on slip...