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Area C mine, Mining Area C (Northern Flank; Packsaddle), Weeli Wolli Creek Area, East Pilbara Shire, Western Australia, Australiai
Regional Level Types
Area C mineMine
Mining Area C (Northern Flank; Packsaddle)- not defined -
Weeli Wolli Creek AreaArea
East Pilbara ShireShire
Western AustraliaState

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Lock Map
Latitude & Longitude (WGS84):
22° 54' 55'' South , 118° 58' 0'' East
Latitude & Longitude (decimal):
Owned/operated by:
BHP (85%), Itochu Minerals (8%)
Locality type:
Köppen climate type:
Other/historical names associated with this locality:
MAC, Area C

Mining Area C (MAC) is an iron ore mine owned and operated by BHP Billiton under the Mt Goldsworthy Joint Venture (85% BHP Billiton, 7% Mitsui Iron Ore Corporation, 8% ITOCHU Minerals and Energy of Australia).

Packsaddle, North Flank and South Flank may also be used to refer to Mining Area C, but these names refer to more specific subdivisions within mine site. The site currently encompasses a series of pits along the North Flank and Packsaddle and ranges. Mining began in 2003 in C-Deposit (of North Flank).

The ranges strike east-west, and are the result of the outcrop of the Marra Mamba and Brockman Banded Iron Formation (BIF) units of the Hamersly Basin. North Flank is the Marra Mamba outcrop on the northern limb of the Weeli Wolli anticline, and South Flank is the southern limb of Marra Mamba. Packsaddle is the Brockman unit, stratigraphically above Marra Mamba and located north of North Flank. The Brockman BIF of the southern limb forms Mount Robinson.

Mineralisation is martite-goethite-ocherous goethite enrichment of the Marra Mamba (North and South Flank ranges) and Brockman (Packsaddle range) BIFs.

Much of the Pilbara region has a variable ferricrete/meteoric influenced overprinting zone known as 'Hardcap'. In places the hardcap is quite vuggy, and it is within these vugs that well developed minerals may grow. The best of the samples found to date lie along the hardcapped paleo-surface of the tertiary detrital/bedrock boundary. Some nice specimens have also been collected from within the hardcapped/cemented tertiary detritals.

Regions containing this locality

Australian Plate (Australia Plate)Tectonic Plate
West Australian Element, Western Australia, AustraliaCraton
Warakurna Large Igneous Province, Western Australia, AustraliaGeologic Province
Pilbara Craton, Western Australia, AustraliaCraton
Fortescue Basin, Western Australia, AustraliaBasin
Hamersley Basin, Western Australia, AustraliaBasin

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

7 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Formula: CaMg(CO3)2
Habit: {1011} rhombs
Reference: J M Bennett Collection
Formula: α-Fe3+O(OH)
Reference: J M Bennett Collection
Formula: Al2(Si2O5)(OH)4
Reference: J M Bennett Collection
Formula: FeAl2(SO4)4 · 22H2O
Reference: Jason Bennett Collection
Formula: Fe2O3
Reference: J M Bennett Collection
Hematite var: Martite
Formula: Fe2O3
Reference: J M Bennett Collection
Formula: (Fe,O,OH,H2O)
Reference: J M Bennett Collection
Formula: SiO2 · nH2O
Reference: J M Bennett Collection
Opal var: Opal-AN
Formula: SiO2 · nH2O
Reference: J M Bennett Collection
Formula: Mn4+O2
Habit: Commonly found as a fine black powder, mammilary or botryoidal crusts, occasionally with sub-millimeter acicular druses perpendicular to these surfaces. Rarely as larger needle splays up to 1cm, or as platy crystals up to 5mm.
Colour: black, silver
Fluorescence: None
Description: Visually identified based on Mn content in whole rock assays, appearance, and black streak.
Reference: J M Bennett Collection
Formula: SiO2
Reference: J M Bennett Collection
'Riebeckite Root Name'
Formula: ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
Habit: Asbestiform
Colour: Blue
Reference: J M Bennett Collection
'Riebeckite Root Name var: Crocidolite'
Formula: ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
Habit: Asbestiform
Colour: Blue
Reference: J M Bennett Collection
'Tiger's Eye'
Reference: J M Bennett Collection
'Tiger's Eye var: Falcon's Eye'
Reference: J M Bennett Collection
Reference: J M Bennett Collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
var: Martite4.CB.05Fe2O3
Opal4.DA.10SiO2 · nH2O
var: Opal-AN4.DA.10SiO2 · nH2O
Group 5 - Nitrates and Carbonates
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Halotrichite7.CB.85FeAl2(SO4)4 · 22H2O
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.
'Riebeckite Root Name'-◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
'var: Crocidolite'-◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
'Tiger's Eye'-
'var: Falcon's Eye'-

List of minerals arranged by Dana 8th Edition classification

Halotrichite29.7.3.2FeAl2(SO4)4 · 22H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Unclassified Minerals, Mixtures, etc.
var: Martite
var: Opal-AN
-SiO2 · nH2O
'Riebeckite Root Name'-◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
'var: Crocidolite'-◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2
'Tiger's Eye'-
'var: Falcon's Eye'-

List of minerals for each chemical element

H Riebeckite Root Name (var: Crocidolite)◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
H Riebeckite Root Name◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
H Goethiteα-Fe3+O(OH)
H Limonite(Fe,O,OH,H2O)
H HalloysiteAl2(Si2O5)(OH)4
H Opal (var: Opal-AN)SiO2 · nH2O
H HalotrichiteFeAl2(SO4)4 · 22H2O
H OpalSiO2 · nH2O
C DolomiteCaMg(CO3)2
O PyrolusiteMn4+O2
O Riebeckite Root Name (var: Crocidolite)◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
O Riebeckite Root Name◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
O QuartzSiO2
O Goethiteα-Fe3+O(OH)
O Limonite(Fe,O,OH,H2O)
O DolomiteCaMg(CO3)2
O Hematite (var: Martite)Fe2O3
O HalloysiteAl2(Si2O5)(OH)4
O Opal (var: Opal-AN)SiO2 · nH2O
O HalotrichiteFeAl2(SO4)4 · 22H2O
O HematiteFe2O3
O OpalSiO2 · nH2O
F Riebeckite Root Name (var: Crocidolite)◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
F Riebeckite Root Name◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Na Riebeckite Root Name (var: Crocidolite)◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Na Riebeckite Root Name◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Mg DolomiteCaMg(CO3)2
Al HalloysiteAl2(Si2O5)(OH)4
Al HalotrichiteFeAl2(SO4)4 · 22H2O
Si Riebeckite Root Name (var: Crocidolite)◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Si Riebeckite Root Name◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Si QuartzSiO2
Si HalloysiteAl2(Si2O5)(OH)4
Si Opal (var: Opal-AN)SiO2 · nH2O
Si OpalSiO2 · nH2O
S HalotrichiteFeAl2(SO4)4 · 22H2O
Cl Riebeckite Root Name (var: Crocidolite)◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Cl Riebeckite Root Name◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Ca DolomiteCaMg(CO3)2
Mn PyrolusiteMn4+O2
Fe Riebeckite Root Name (var: Crocidolite)◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Fe Riebeckite Root Name◻[Na2][Z32+Fe23+]Si8O22(OH,F,Cl)2
Fe Goethiteα-Fe3+O(OH)
Fe Limonite(Fe,O,OH,H2O)
Fe Hematite (var: Martite)Fe2O3
Fe HalotrichiteFeAl2(SO4)4 · 22H2O
Fe HematiteFe2O3

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

0 - 2.588 Ma

ID: 694349
colluvium 38491

Age: Pleistocene (0 - 2.588 Ma)

Description: Colluvium and/or residual deposits, sheetwash, talus, scree; boulder, gravel, sand; may include minor alluvial or sand plain deposits, local calcrete and reworked laterite

Comments: regolith; synthesis of multiple published descriptions

Lithology: Regolith

Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia). [5]

Siderian - Neoarchean
2300 - 2800 Ma

ID: 3185955
Archean-Paleoproterozoic sedimentary and volcanic rocks

Age: Precambrian (2300 - 2800 Ma)

Stratigraphic Name: Hamersley Group

Comments: Hamersley Basin

Lithology: Strataform assemblage(s); felsic volcanic rocks; chert,carbonate,iron formation,shale

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

External Links

http://www.bhpbilliton.com/home/investors/reports/Documents/2013/BHPBillitonAnnualReport2013_Interactive.pdf - BHP Billiton Annual Report 2013

http://dbforms.ga.gov.au/pls/www/geodx.strat_units.sch_full?wher=stratno=2602 - Stratigraphic Information for the Brockman Iron Formation on the Australian Stratigraphic Names Database

http://dbforms.ga.gov.au/pls/www/geodx.strat_units.sch_full?wher=stratno=11353 - Stratigraphic Information for the Marra Mamba Iron Formation on the Australian Stratigraphic Names Database

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
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