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Exploration For Iron Ore

History of Deposit Exploration

  • Mabrouk Minerals Pty Ltd – “Mabrouk Minerals” - first noted the potential for Iron Ore at Cashmere Downs in 2003.
  • An airborne magnetic survey revealed strong magnetic anomalies associated with prominent Banded Iron Ridges. This led to:
  • Large scale assessments designed to delineate potential Iron ore targets based on satellite imagery and
  • Aeromagnetometry
  • Preliminary gravity surveys
  • RC reconnaissance drilling program and
  • Preliminary metallurgical testing.

Site clean up   Site clean up   Site clean up   Site clean up

Completion of drilling program on the siteSelect to enlarge

Resource Definition

Inferred Resource (Mabrouk Minerals: Mackay and Schnellmann 2005)

  • Preliminary exploration led to a Resource Definition Program, which covered the southern portion of the NW Target Area. This area is located on the NW flank of the northern synclinal structure. The program was conducted from late 2004 and 2005 by Mackay and Schnellmann (Geological Consultants).
  • The program included geological mapping, geophysical interpretation and RC drilling with down hole geophysical surveys. This work covered 2.5km of the ridge top meta-BIF.
  • Iron mineralization is present as Magnetite Banded Iron Formation (BIF) at depth, and near surface oxidized Haematite.
  • The JORC (Australasian Joint Ore Reserves Committee) Code compliant Inferred Resource was estimated at:
  • Haematite Banded Iron Formation: 25M Tonnes at 35.6% Fe and Magnetite Banded Iron Formation: 135 M Tonnes at 36.7% Fe.
  • Total for both Types; 160M Tonnes at 36.5% Iron.
  • Beneath the Inferred Resource, is a Magnetite Banded Iron Formation Deep exploration target of 179M tonnes.
  • Davis Tube testing showed that a high-grade Fe concentrate with over 40% weight recovery could be produced from the resource.
  • In Oct 2007 a new JORC Resource Program was commenced to drill the entire 7.5km of the NW Target Area.
  • All geological work and program supervision has been by Consultants MacKay & Schnellmann.
  • 91 holes were drilled for over 16,000m of RC drilling and 1600m of diamond core.
  • 3m down hole composites were tested by Davis Tube for concentrate quality and recovery.
  • Metallurigical testing by AMMTEC and Promet Engineers.

JORC Compliant Resource Statement

Leading resource consultant Al Maynard & Associates Pty Ltd completed the independent JORC Code compliant magnetite and hematite resource estimate at Cashmere Downs.

Mineral Resource Summary Table Independent Geological Report March 2012 Mineral Resource Summary Table

Metallurgical studies show that a magnetite concentrate of greater than 66% Fe with Silica levels of 4.5% SiO2 can be achieved with a weight recovery in excess of 40%.

This gives a combined Magnetite-Haematite Resource total of 1,014 million tones of which 92% falls within the Measured/Indicated categories.

Additional Deep Target Mineralisation

Below the magnetite bearing banded iron formation resource and from a depth of 200m RL to 0m RL, Mackay & Schellmann Pty Limited find there to be a magnetite bearing banded iron formation target that ranges from an additional 660Mt to 920Mt. No grade is ascribed to this deep exploration target, nor is any opinion expressed on the Davis Tube recovery. This deep exploration target is considered to be conceptual in nature at this time as there has not yet been sufficient exploration to define the mineral resource and it is uncertain whether further exploration would result in determination of mineral resources. A major high-grade magnetite deposit of strategic significance.

Further Reconnaissance/Exploration (Magnetite/Haematite)

  • Drilling along strike south of the NW Measure/Indicated Resource has also intersected significant magnetite core enrichment giving DTR's of over 68%Fe with +42% weight recoveries
  • Eastern ridges show a repition of rock types similar to the western flank of the structure.
  • Reconnaissance RC drilling of the NE Target Area has intersected high grade magnetite bearing meta-BIF.
  • Geological mapping has revealed other magnetite bearing meta-BIF units within the southern block of the tenements. Potential haematitic deposits have also been mapped. These take the form of haematitic channel fills, canga deposits that flank the main ridges and haematitic cap enrichments of the BIF, which has give rock chip results as high as 64% Fe.
  • Exploration for iron channel deposits will begin at the Arrowhead structure within the NW Target Area. A drilling program is planned to define an open-ended 1500m long haematitic canga filled channel.

Geological Cross Section

 

Cross Section

 

Listed below are highlight results from the last RC drilling program carried out at Cashmere.

Highlight results are presented below in Table 1.

Hole ID      From    To    Interval    Fe %    Si02 %    Al2O3%    P %   
KK 6m 20m 14m 54.89 11.0 3.3 0.12
AH5RC36 14m 18m 8m 52.0 9.0 3.6 0.008
AH5RC36 36m 42m 12m 55.0 7.87 2.3 0.16
AH5RC40 1m 3m 2m 53.59 12.0 2.9 0.02
AH5RC46 3m 5m 2m 53.8 6.5 5.7 0.04
AH5RC46 8m 10m 2m 60.63 3.01 0.04 0.05
AH5RC50 2m 7m 5m 53.4 13.0 3.8 0.04
AH5RC54 4m 12m 8m 54.2 11.0 5.05 0.05
AH5RC58 2m 6m 3m 53.7 10.3 5.1 0.03
AH5RC58 6m 8m 2m 54.7 7.01 4.38 0.08
AH125 16m 38m 22m 51.5 11.8 3.05 0.02
CWRC32 0m 4m 4m 52.89 10.7 4.0 0.02
OS2 4m 14m 10m 59.14 4.4 2.8 0.08
OS3 6m 10m 4m 50.9 12.0 4.1 0.06
OSN1 8m 16m 8m 53.8 8.0 4.4 0.06
CW77 2m 8m 6m 57.6 9.3 3.37 0.02
Lump1RC1 4m 7m 6m 54.3 9.1 4.82 0.03
Lump1RC1 9m 15m 12m 54.9 8.8 5.2 0.04
LP3 20m 24m 4m 56.9 8.8 2.7 0.04
LP6 18m 28m 10m 56.11 7.7 2.5 0.08
LP8 14m 20m 6m 52.6 8.14 5.54 0.08
LP10 2m 8m 6m 55.04 9.0 2.79 0.1
LP10 10m 20m 10m 56.69 6.26 4.7 0.08
*Table 1

Table 2: Encouraging Drillhole

Area 3A and Area 6 had been drilled in the previous drilling program late 2010 however no previous drilling had been completed on the other three zones. Highlight intersections are presented in Table 3.

Hole ID       From (m)    To (m)     Interval    Fe %   
T18RC4 16m 30m 14m 56.01
T18RC13 8m 20m 12m 56.1
T18RC14 4m 6m 2m 54.95
T17BRC5 2m 16m 8m 57.81
T17BRC7 2m 10m 5m 56.1
DF6RC9 0m 6m 6m 52.09
LP26A 6m 12m 6m 51.38
LP22 4m 6m 2m 53.71
*Table 2

Table 3: Encouraging Drill hole Results 2011.

Rock chip samples collected within Area 3A have returned values of up to 58.21% Fe. The following table lists some of sample results collected to date.

Rock chip ID       Max Fe (%)   
T5-4 54.52
T5-8 54.52
T6-9 55.36
T6-11 58.21
*Table 3

Table 4: Encouraging Rock chip samples from Area 3A.

Area 8N consists of the best enriched in-situ hematite target. The following table lists sample results collected to date from Area 8 North.

Rock chip ID          Easting      Northing      Max Fe %    
Rockchip T18-2 756864 6807029 57.86
Rockchip T18-3 756869 6807018 59.00
Rockchip T18-4 756876 6807011 62.91
Rockchip T18-5 756896 6807008 60.76
Rockchip T18-6 756906 6806996 58.37<
Rockchip T18-7 756905 6806994 62.46
Rockchip T18-8 756920 6809685 64.84
Rockchip T18-9 756932 6806974 51.43

Rockchip T18-10 756946 6806956 59.69
Rockchip T18-11 756949 6806956 65.21
Rockchip T18-12 756972 6806946 62.06
*Table 4
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Landsat Map
Landsat Magnetite Anomaly Image
Gallery
Cashmere Downs Deposit Exploration Gallery Cashmere Downs Deposit Exploration Gallery Cashmere Downs Deposit Exploration Gallery Arrowhead Hematite Channel Fill
 
® Cashmere Iron 2015