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A substantial infill/expansion drill programme is planned; drilling to establish constraints of depth, continuity to the south, and mineralised structures in the andesite has commenced.
The existing site that allowed WKP29 and WKP30 drillholes has probably been used again for more infill data, and the rig will be somewhere else nearby at the moment.
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Coromandel Volcanic Zone and Hauraki Goldfield
Some 50 separate epithermal Au-Ag deposits are associated with Miocene-Pliocene calc-alkaline volcanic rocks of the Coromandel Volcanic Zone in a 200-km long by 40-km wide metallogenic belt that constitutes the Hauraki Goldfield (Brathwaite & Piranjo, 1993; Brathwaite et al., 1989, Fig. 1B). The Hauraki Goldfield has a recorded (1862-present) production of more than 380 t of gold and 1300 t of silver, mostly from deposits hosted by andesite and dacite, although a few veins in rhyolite and basement greywacke were also worked. The Waihi (Martha Hill) deposit is by far the largest, with total gold production to date of about 202 t (6.5 M oz), ranking it as world class deposit. Major production also came from Golden Cross (37.1 t Au), Karangahake (29.4 t Au) and the Thames field (21.8 t Au). The Au-Ag mineralisation occurs predominantly in quartz veins along tectonically-controlled fault-fracture systems, which are parallel with the main regional fault trends. The quartz veins dip at steep to moderate angles and are typically 0.3-5.0 m wide, 200-1600 m long, and have depth extents of 170-300 m. A few larger veins display a greater depth range (400-700 m) as at Waihi and Karangahake. Stockwork quartz veins are present in some deposits (e.g. Golden Cross). The quartz veins are surrounded by extensive zones of propylitic and clay alteration characterised by chlorite, calcite, illite, smectite and pyrite as hydrothermal minerals. Higher rank alteration with strong silicification plus adularia and/or illite borders the quartz veins.