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BURRA BURRA MineS

BURRA - SOUTH AUSTRALIA

AUG 28TH 2020

COPPER MINE & OPEN CUT

GEOLOGY

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Zones

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Curdimurka Subgroup

Siltstone, dark grey, carbonaceous, lithic, pyritic, laminated, micaceous; sandstone, feldspathic, lithic, cross bedded, halite casts; dolomite, stromatolitic, cryptalgal laminated, brown to yellow weathering; limestone, stromatolitic.

NEOPROTEROZOIC

Willouran

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Skillogalee Dolomite

The Skillogalee Dolomite is split into units 6 and 7 around the town of Burra, these act as members to distinguish differences in the formation and are important for mining operations and exploration. The Kooringa Member of the Skillogalee Dolomite is also located around the Burra Burra Mines but no good visible outcrops are visible.

Kooringa Member:

The member is comprised of siltstone, carbonaceous siltstones, pyritic siltstones, volcaniclastic sediments like tuff and agglomerate, Along with dolomite with siltstone interbeds, limestone that is massive, flaggy and laminated with cryptomicrobial or stromatolitic and intraclastic sediments. Uranium–lead Dating (U-pb dating) ages from 788 ± 7 Million Years.

Skillogalee Dolomite unit 6

Lower member, typified by pale dolomite. BURRA: interim unit for compilation.

NEOPROTEROZOIC
Torrensian

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Skillogalee Dolomite unit 7

Upper member, typified by dark dolomite. BURRA: interim unit for compilation.

NEOPROTEROZOIC
Torrensian

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Erosional Alcoves & Overhangs

Alcoves Visible in the Skillogalee Dolomite Unit 7 are visible on the side of the road and show erosion of softer parts of the unit below a hard-capped light dolomite.

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Azurite

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The Burra Burra Mines

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Vertical Shafts

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The 1870 - 1877 Open Cut

The original mine was converted to an open cut in 1870, this allowed the ore lode to be mined on a larger scale, although the first open cut was short lived it produced ???. With the "Monster Mine" approved the original open cut was destroyed entirely, engine houses were either taken apart piece by piece and re built away from from the projected new mining operations or completely destroyed. 

"The open cut here has been unwatered, thereby reducing the water level of the whole of the mine by 13ft. Prospecting has been carried on between surface and water level and various good bodies of low-grade ore located" - A review of mining operations in the state of South Australia during the year ended June 30th 1906, No° 5 (P. 14).

The "Monster Mine" Open Cut

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REFEreNCES

South Australian Government. (n.d.). SARIG geological map. SARIG. 

Minister of Mines, South Australian Government. (1906). A review of mining operations in the state of South Australia during the year ended June 30th 1908, No° 5. C. E. Bristow, Government Printer North Terrace. (P. 14). SARIG online store. 

Cowley W.M. and Preiss, W.V. (2016). Mineralisation in the Mid-North. Geological field excursion guide — Rifts, reverse faults and regolith: Neoproterozoic to Cenozoic geology in the Mid-North of South Australia.  (pp. 22–26). Report Book 2016/00013. State Development, South Australia; and Geological Society of Australia, South Australia. SARIG. 

South Australia Department of mines and Energy and Natural Resources. (1995, February). Burra Mine.

Julian Ratcliffe. (2008). The Burra Burra Mine. The Burra History Group Inc.

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GHOST RANCH
NEW MEXICO, U.S.A
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DEAD MAN'S PASS
SOUTH AUSTRALIA
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BORAH FAULT SCRAP
IDAHO, U.S.A