Mount Uro. Progress, partial surrender [and ?final] reports to licence surrender for the period 29/4/1984 to 26/2/1987.
Created: 28 Oct 2024 Revised: 07 Dec 2024

Adelaidean and Cambrian calcareous clastic rocks of the Angepena region were investigated for possible economic epigenetic base and precious metal mineralisation that may be related to syn-depositional faulting, as well as for stratiform and...

Adelaidean and Cambrian calcareous clastic rocks of the Angepena region were investigated for possible economic epigenetic base and precious metal mineralisation that may be related to syn-depositional faulting, as well as for stratiform and sedimentary exhalative (sedex) type lead-zinc ores. E-Z's evaluation of previous exploration work done in the central Flinders Ranges had concluded that good potential remained for the discovery of metal mineralisation other than that of copper, which was the main commodity sought in the past. Because the oxidised zinc mineralisation found in faulted Cambrian carbonates at the Beltana and Arooona deposits is thought to be derived from sulphide mineralisation, E-Z considers that potential exists to find similar style mineralisation in other faulted calcareous units, e.g. those of the Wilpena and Umberatana groups as well as the Cambrian. In its search for epigenetic mineralisation the licensee undertook reconnaissance grab sampling at historic mineral prospects, regional geological mapping and logging of measured stratigraphic sections, regional stream sediment sampling, and follow-up stream sediment and rock chip sampling (in all totalling 996 samples) across faulted sections of target Wilpena Group formations in three structurally different areas. This geochemical exploration work disclosed only minor metal anomalism, although, within the Wonoka and Bunyeroo formations in the Pinda Springs area, brecciated and veined albitic and pyritic meta-cherts containing minor sideritic and sulphidic boxworks may warrant further investigation. The bulk of the licence was consequently relinquished at the end of the second year of tenure. Weathered Cambrian clastic rocks on the southern limb of the Angepena Syncline were stream sediment sampled (282 samples) for indications of stratiform, low pyrite sedex style base metal ores which tend not to form gossans. Geostatistical analysis of the assay results showed that the majority of Pb and Zn samples also contain anomalous Fe and common high Mn, Co and Ni, pointing to the influence of scavenging during lateritisation. Anomalous zinc values recorded from the Oraparinna Shale and Parachilna Formation are apparently related to lateritic ironstones existing within or on the boundaries of these units, where the latter example is developed particularly strongly at the boundary with the underlying Wilkawillina Limestone. Due to unforseen ground sterilization for exploration in the north-eastern portion of the licence area, caused by a pending land ownership transfer of the Nepabunna Mission freehold from the SA Government to the local Anyamathana aboriginal community, the majority of the planned sedex base metal exploration programme was unable to be progressed. The hard rock source for the gold found in the Angepena Goldfield appears to be a stratiform ironstone horizon present at the top of the Etina Formation, which is probably derived from weathering of syngenetic pyrite because of its structureless nature. This horizon extends for at least 6 km of strike length upstream of the old gold workings, but past underground exploration and current rock chip sampling failed to detect any positive gold values; however, the latest sampling does show the presence of elevated Co, Ni and As.

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About this record

Record No mesac12665
Topic Geoscientific Information
Type of Resource Document
Category Type
Document Type Mineral Company Report - Mineral Exploration
Contributor Pontifex and Associates Pty Ltd
Sponsor Electrolytic Zinc Co. of Australasia Ltd
Tenement EL 1235
Tenement Holder Electrolytic Zinc Co. of Australasia Ltd
Operator Electrolytic Zinc Co. of Australasia Ltd. Mineral Resources Div.
Geological Province
Mine Name Angepena Gold Field;Mucatoona mine;Angepena Treasure gold mine;Christmas Gift mine;Nevada mine;Mount Serle lead workings
Stratigraphy
Commodity
Notes
Notes: Licence final report is [?was] stored separately in Env 6651.  Part of the original EL 1235 area has now being incorporated as part of the another new tenement, Mucatoona EL 1345, issued to Electrolytic Zinc Co. on 27/9/1986 (see Env 6759)....

Notes: Licence final report is [?was] stored separately in Env 6651. Part of the original EL 1235 area has now being incorporated as part of the another new tenement, Mucatoona EL 1345, issued to Electrolytic Zinc Co. on 27/9/1986 (see Env 6759). Geographic Locality: Central Flinders Ranges;Mount Uro;Mount Wallace;Angepena Station;Mount Serle Homestead;Mount Serle Diapir;Waukawoodna Creek;Pinda Springs;Pinda Diapir;Alerumba Creek;Windy Creek Doc No: Env 05647

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Language English
Metadata Standard ISO 19115-3

Citations

Use constraints License
License Creative Commons Attribution 4.0
Persistent identifier https://pid.sarig.sa.gov.au/document/mesac12665
Citation Circosta, G.;Pontifex, I.R.;Schmidt, B.L. Mount Uro. Progress, partial surrender [and ?final] reports to licence surrender for the period 29/4/1984 to 26/2/1987. Mineral Company Report - Mineral Exploration
https://pid.sarig.sa.gov.au/document/mesac12665

Technical information

Status
Maintenance and Update Frequency
Geographic Reference GDA2020 (EPSG:7844)
Geo bounding box {"type":"Polygon","coordinates":[[[138.501313,-30.831838],[139.167974,-30.831838],[139.167974,-30.4985],[138.501313,-30.4985],[138.501313,-30.831838]]]}
Purpose

                    
                    

                    
                  
Lineage