https://theses.otagogeology.org.nz/files/original/d5ede32fbd2fa3d736cbd25f9f5b3ba6.pdf 0f5e608165159ae38f8135c33bde6ce4 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((171.880595031720304 -42.127729991917725,171.893774311229606 -42.126428070975187,171.908555876473656 -42.126855592022544,171.906323098572074 -42.139416143324375,171.901092679509446 -42.141939711828954,171.880552946389031 -42.141026256121279,171.878953096002903 -42.139151961045954,171.879133589909372 -42.134364064327038,171.880595031720304 -42.127729991917725)) Author last name Last name of the Author Stick Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student MacKenzie, D. Scott, J.M. Abstract The Abstract for this thesis The Reefton Goldfield produced over 67 tonnes of hard rock gold from 84 mines between 1870 and 1951, making it one of New Zealand’s richest goldfields. Reaching a depth of 692 m, the Energetic gold mine, in the Crushington group of mines was the third largest producer. Hosted in Greenland Group metasediments, the mine produced 208,992 ounces of gold during operation between 1870 and 1927 when it closed due to an underground collapse This report details the first comprehensive study of the Energetic mine and the surrounding Greenland Group host rocks. The Energetic shear zone hosts the Energetic mine on the eastern limb of the NE-striking Globe Hill Anticline. The shear zone comprises two variably mineralised faults that host three main quartz reefs. One NE-striking fault is controlled by both local bedding and cleavage whereas the other (NNW-striking) is controlled primarily by cleavage. The formation of these faults was the result of an ENE-WSW shortening direction, oblique to the local bedding but perpendicular to the NNW-striking, cleavage controlled fault. Alteration surrounding the Energetic shear zone is asymmetric to the west, most noticeably through As and S concentrations obtained through geochemical analysis of the RDD0048 drillcore. This alteration appears to be lithologically controlled to argillite. The argillaceous units were preferentially sheared and their relative impermeability compared to greywacke units prevented fluids from migrating into and altering the surrounding host rock to the east. Early hydrothermal fluids migrated into the wall rocks and altered carbonate spots in argillaceous units from ankerite to siderite proximal to mineralised zones. This compositional change is the most reliable exploration vector at the Energetic mine. Associated with this phase was the formation of wall rock sulphides that due to continual shearing were deformed and had antitaxial strain shadows form around them. The main stage of gold mineralisation along the Energetic shear zone is associated with dark grey quartz and stylolitic veins that contain pyrite. These veins are hosted in and cut early ductiley deformed quartz lodes. These veins and later crosscutting veins are more brittle in nature and indicate mineralisation along the shear zone may have been prolonged. Brittle structures have overprinted earlier ductile structures and are now the most prominent feature of mineralised rocks. The mineralised rocks are highly deformed and a succession of mineralised veins cut the rocks. Pressure solution effects are commonly associated with both ductile and brittle structures and show the prolonged nature of deformation along the shear zone. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Reefton Thesis description Number of pages, maps, CDs, etc. 155p Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2015Stick Creator An entity primarily responsible for making the resource Stick, George Nicholas, 1992 (George) Date A point or period of time associated with an event in the lifecycle of the resource 2015 Title A name given to the resource A structural, paragenetic and geochemical study of the Energetic gold mine, Reefton Goldfield, New Zealand Subject The topic of the resource Geochemistry Metamorphic geology Metamorphic petrology Mineralogy Ore deposits Alteration Buller Terrane deformation Energetic Mine Energy Dispersive Spectroscopy (EDS) gold Greenland Group Greenschist Facies metamorphism mineralisation Orogenic gold quartz veins Reefton goldfield Reefton Group shear zones