Category Archives: Copper Hill

Copper Hill Scoping Study

  • Scoping Study completed as planned
  • Project outcomes support commencement of a Pre-Feasibility Study (PFS)
  • Enhanced Metallurgical Recoveries for higher grade samples
  • Opportunities for further project enhancements identified
  • Significant exploration potential at depth

Golden Cross Resources Limited (ASX:GCR) is pleased to announce that further to the ASX releases on 5 and 24 March 2015, the Scoping Study for a 2 – 3Mtpa (Million tonnes per annum) development, based on the 28Mt higher grade resource is now complete.

The Production Target referred to in this announcement is based on Indicated Mineral Resources (67%) and Inferred Mineral Resources (33%). There is a low level of geological confidence associated with Inferred Mineral Resources and there is no certainty that further exploration will result in determination of further Indicated Mineral Resources or that the production target or preliminary economic assessment will be realised.

Outcomes from the Scoping Study are positive and the Company plans to commence a Pre- Feasibility Study as soon as possible, for this style of development at Copper Hill. Resource Estimate The updated Copper Hill Scoping Study is based on the updated JORC 2012 compliant Resource Estimate*, released to ASX on 24 March 2015. This estimate honours the structural controls and geology of higher grade mineralisation and is summarised below in Table 1 extracted from the 24 March 2015 report. The 28Mt higher grade resource, and its Indicated and Inferred Mineral Resource components calculated using a 0.4% copper cutoff, on which this Scoping Study is based, is highlighted in Table 1 below.

chartxx

Copper Hill Resource Estimate

  • Revised geological model provides upgraded JORC 2012-compliant resource
  • Higher grade (0.4% Cu cut-off) resource of 28Mt at 0.56% Cu and 0.53g/t Au
  • Significant exploration potential for the source mineralised pipe at depth
  • Scoping Study for 2 – 3Mtpa operation on track for mid-April completion

Golden Cross Resources Limited (ASX:GCR) is pleased to announce that further to the release on 5 March 2015 the revised resource estimate for Copper Hill copper-gold
project has been completed and the Scoping Study based on the 28Mt higher grade resource remains on schedule for release by mid-April.
Resource Estimate
Independent resource consultant James Ridley has completed the up-dated JORC 2012- compliant resource estimate for the Copper Hill Project. Importantly this estimate incorporated the recent detailed geological and structural analysis of the 2014 drilling, detailed surface mapping and multi-element analytical data which has delivered an improved understanding of a number of controls on the mineralisation at Copper Hill;

  • Strong grid NW and N-S structural orientations with weaker, but still material, NE fracture set.
  • Structures generally defined by quartz-pyrite dominated veins and fractures.
    C
    opper and gold mineralisation generally occurs as later stage chalcopyrite/pyrite veins within these quartz veins and fractures with significant disseminated style mineralisation also present.
  • A higher grade core to the mineralisation focussed in the areas of greatest structural intensity, especially at the intersection of N-S and NW trending structures. Lower grade ore is generally typified by weaker veined and/or disseminated style mineralisation.
  • Higher gold to copper ratios within the core of the high grade zone with Au:Cu generally around 3:1 (ie; 3g/t Au : 1% Cu) compared with a ratio of 1:1 for the deposit overall.
  • A sub-horizontal 10 – 20 metres thick zone of supergene enrichment centred in the transitional weathering zone 25 – 70 metres below surface.

The combination of these factors has led to an enhanced geological model for the deposit and greater continuity than previously recognised for the higher grade zones. The recognition of preferred structural orientations for the mineralisation enabled drill intercepts which were previously considered “outliers” or “spotty highs” to be incorporated within relatively continuous grid N-S or NW higher grade zones. This in turn provides improved definition of the higher grade mineralisation which is the focus of this resource estimate and the Scoping Study. Figure 1 shows the continuity of the higher grade mineralisation in the current resource model.

Click here to download this release as a pdf file

Copper Hill Update

  • Revised geological model leading to upgraded resource on schedule
  • Enhanced metallurgical recoveries for higher grade ore
  • Revised capital and operating costs being developed
  • Significant exploration potential identified

Golden Cross Resources Limited (ASX:GCR) is pleased to announce that the management team has completed the geological review of the Copper Hill copper-gold project and the revised resource estimate and Scoping Study for the project are progressing on schedule. The resource estimate by independent consultant James Ridley is well advanced with the results to be released in mid-March while the Scoping Study based on a 2-3 Mtpa operation is planned to be completed by mid-April.

Geological Review and Resource Estimate
As reported on 30 January recent detailed geological and structural analysis has improved the understanding of a number of controls on the mineralisation at Copper Hill. These include;

  • A strong grid NW structural orientation which controls the bulk of the low to medium grade (0.2 – 0.3% Cu) mineralisation outside the high grade zones
  • Grid north IV south high grade zones which were mined in the past
  • A weaker, but still material grid NE trending set of structures, also hosting historical workings
  • A higher grade core to the mineralisation focussed in the areas of greatest structural intensity, especially at the intersection of N-S and NW trending structures. The main Copper Hill zone extends over a strike length of at least 400 metres and widths of 100 – 200 metres and to depths of up to 300 metres. It is outlined by the 0.3% Cu outline or wireframe (see Figure 1). In addition, steeply plunging “pipe-like” high grade zones are present at Buckley’s Hill and south of Copper Hill. The plunge of these zones is consistent with the intersection of the N-S and NW structures.
  • Higher gold to copper ratios within the core of the high grade zone with Au:Cu generally around 3:1 (ie; 3g/t Au : 1% Cu) compared with a ratio of 1:1 for the deposit overall.
  • A sub-horizontal 10 – 20 metres thick zone of supergene enrichment centred in the transitional weathering zone 25 – 70 metres below surface.

The combination of these factors has led to an enhanced geological model for the deposit and greater continuity than previously recognised for the higher grade zones. The recognition of preferred structural orientations for the mineralisation enabled drill intercepts which were previously considered “outliers” or “spotty highs” to be incorporated within relatively continuous grid N-S or NW higher grade zones. This in turn provides improved definition of the higher grade mineralisation which is the focus of this resource estimate and the Scoping Study.

Click here to download this release as a pdf file

Subscription expired
RSSbox powered by rssinclude.com

There is no custom code to display.