Drilling Continues to Shine at Juruena with 12m @ 35.13 g/t Gold
Perth, July 1, 2015 AEST (ABN Newswire) - Crusader Resources Limited's (
ASX:CAS) first drilling program at Juruena to test the first of four high grade prospects continues to deliver with new results received, including the extraordinary 12m @ 35.13 g/t in hole MR-10 and 1.87m @ 84.50 g/t Au in hole MD-01. Both results from the Crentes/Dona Maria prospect.
Highlights
- Crusader's Juruena Gold Project continues to deliver with spectacular results from a series of prospects on the Juruena Belt, continuing to highlight the opportunity to develop a new multi-project district. Crusader controls approximately 447km2 of the Alta Floresta Gold Belt
- These results are across three individual prospects - Dona Maria/Crentes, Querosene, and Capixaba spread along approximately 5km of the mineralised Juruena fault
- Crentes/Dona Maria
* 3.38m @ 47.97 g/t Au from 183.62m in MD-01, including 1.87m @ 84.50 g/t Au from 183.62m
* 12m @ 35.13 g/t Au from 99m in MR-10, including 4m@ 75.07 g/t Au from 99m
* 4m @ 5.19 g/t Au from 12m and 12m@ 1.62 g/t Au in CR-05
- Querosene - Target
* 2m @ 9.6m g/t Au from 48m in QR-28
* 0.5m @ 7.02 g/t Au from 110.7m in QD-05
* Metallurgical results indicate recoveries >90%
* Maiden Resource estimate underway
- Capixaba
* 3m @ 4.30 g/t Au from 32m in CXR-04
* 2m @ 8.28 g/t Au from 62m in CXR-09
* 4m @ 8.26 g/t Au from 60m in CXR-13
Crusader's Executive Director Paul Stephen commented, "These recent results continue the positive drilling from Juruena. Importantly, the results from the metallurgical sampling at Querosene are also positive, indicating recoveries greater than 90% utilising a standard CIP flowsheet. Juruena is rapidly developing into a multi-prospect gold district with the opportunity to develop a series of deposits all located in close proximity and we have only barely scratched the surface of its potential."
Juruena Gold Project Update
The Juruena project (> 400km2 of contiguous tenements, 100% Crusader owned) is located in Central Brazil on the southern fringe of the Amazon basin. Situated on the western end of the prospective Juruena-Alta Floresta Gold Belt (estimated to have produced ~7Moz), Juruena has been worked extensively by artisanal miners (garimpeiros) since the 1980s.
Reported results are from four different prospects, Querosene, Crentes, Dona Maria and Capixaba (see Figure 1 in link below). An outstanding result from RC hole MR-10 drilled at Dona Maria was the standout, with assays returning 12m @ 35.13 g/t from 99m. This intersection was a series of 4m composite samples from an area which historically has returned some other outstanding results (like 6.62m @ 20.61 g/t Au from 112.5m and 4.66m @ 64.3 g/t Au from 124.7m in J-07).
Favorable metallurgical results have also been received from a composite sample collected from the Querosene prospect, considered Crusader's most advanced prospect.
These four prospects represent a small fraction of the potential target area and are located in close proximity to each other. Each prospect represents a unique mineralised system, with differing amounts of historical work. Crusader's systematic approach to the targeting of these prospects will help with an overall understanding of the geological setting in the region, which appears to be a district scale gold mineralised system, linked by a structural corridor hosting multiple gold prospects. Intense and localised phyllic alteration along various structures appears to define the gold zones. Crusader is beginning to understand the enormous scale of the project- defined by a 'giant' high-grade gold in soil anomaly, the footprint of which is estimated at 8km x 4km.
Results released today include high-grade intercepts from the Querosene and Capixaba prospects as well as the high-grade intercepts from Crentes/Dona Maria described above. A total of 7,750m of RC and 1,864m of diamond core were completed by Crusader, with hole numbers and metres drilled summarised below:
- Capixaba - 16 RC holes for 1,615m
- Querosene - 30 RC holes for 3,430m and 8 diamond holes for 1,315m
- Crentes - 17 RC holes for 1,699m and 1 diamond hole for 182m
- Dona Maria - 10 RC holes for 1,065m and 2 diamond holes for 367m
Querosene Prospect
Metallurgical Sampling
Results from preliminary testwork on samples from the Querosene prospect have been received and indicate recoveries > 90% for both gold and silver using standard leaching. Crusader sent a 50kg composite sample of RC chips to a certified metallurgical laboratory in Belo Horizonte (Testwork Desenvolvimento Processo Ltda.) for preliminary metallurgical and comminution testwork.
The sample tested had a head grade of 7.41 g/t of Au and 11.84 g/t of Ag. The testwork included;
- Physical characterisation of the ore
- Size distribution and leaching by fraction
- Gravity concentration and leaching
- Leaching curves with/without oxygen and or carbon
Results indicate that;
- A work index of 19.1KWh/t and a specific gravity of 2.40 g/cm3 (physical characterisation and assay work was completed by SGS Geosol laboratory)
- The size distribution work indicates that the gold and silver is very fine and well distributed within the ore, with >40% of the gold in the fraction finer than 45µm
- Gold recovered through gravity was low at <20%, supporting the size distribution results that gold is fine. Intensive leaching after gravity did not significantly increase the overall gold recovery, with gold recoveries of 90.6% for 106µm grind and 91.3% for 75µm recorded (88.7% and 89.4% for Ag recorded respectively)
- 24 hour leach tests at two grind sizes (106 and 75µm) were performed on samples with and without oxygen. Gold recovery results varied from 86.3% to 91.2% with best results achieved using the finer grind of 75µm and oxygen. Silver recoveries varied from 83.7% to 90.4% with the best recoveries also achieved with the addition of oxygen and using the 75µm grind. Cyanide consumption averaged 343 g/t which is considered low
- Leaching tests were also performed on the different size fractions with carbon in the leach tank, again achieving gold recovery results between 90.6% and 91.2% (88.6% - 90.7% silver).
Results are very encouraging and indicate that the ore is not refractory and should liberate well in a CIP/CIL beneficiation plant. Additional tests are planned to assess potential to improve recovery from the Querosene ore. Results will be reported once received.
Drilling Results
Results released today include several diamond and RC drill holes with several holes returning higher grade, narrow intersections. A full table of results is included at the end of this report. Better intercepts included:
- 2m @ 9.6m g/t Au from 48m, including 1m @ 16.21 g/t Au from 49m in QR-28
- 0.5m @ 7.02 g/t Au from 110.7m in QD-05
Results from Querosene indicate that the higher grade mineralisation is concentrated in the central and southern portion of the shear zone, extending further south than previously expected. The easternmost vein which extends the furthest to the south remains open and several of the new results from holes oriented specifically at this area have extended the mineralisation another 100m to the south. There is one hole outstanding at the lab and results should be received within two to three weeks.
The entire mineralised system remains open at depth (see Figures 2 & 3 in link below).
Crusader is also preparing a maiden JORC compliant mineral resource estimate at Querosene. Work on the estimate requires final results for all of the drilling, anticipated by mid-July. The resource estimate should take ~ 1 month from the receipt of final results.
Crentes Prospect
Mineralisation at Crentes occurs within the regional Juruena fault structure and frequently comprises multiple mineralised horizons over a cumulative width of over 20m. Better intercepts include: 4m @ 5.19 g/t Au from 12m and 12m @ 1.62 g/t Au in CR-05.
Dona Maria Prospect
Results received from Dona Maria, a mineralised splay off the main Crentes structure, include 12m @ 35.13 g/t Au from 99m in MR-10, including 4m @ 75.07 g/t Au from 99m, and 3.38m @ 47.97g/t from 183.62m in MD-01, including 1.87m @ 84.50 g/t from 183.62m.
Interpretation of results to date, including historical drilling, indicates a thickening of the mineralisation, with local extremely high grades in the area of the junction between the Crentes and Dona Maria structure. The intersection in MD-01 is located at the southern extremity of the Dona Maria structure close to this junction, and may relate to the Crentes structure. All assay results have now been received and a detailed interpretation of the available data is in progress in preparation for the Crentes/Dona Maria ore resource estimate.
Capixaba Prospect
Results have been received for all 16 holes drilled at Capixaba, testing a number of parallel, narrow shear-hosted mineralised horizons. Better results include:
- 3m @ 4.30 g/t Au from 32m in CXR-04
- 2m @ 8.28 g/t Au from 62m in CXR-09
- 4m @ 8.26 g/t Au from 60m in CXR-13
To view tables and figures, please visit:
http://media.abnnewswire.net/media/en/docs/80307-ASX-CAS-724948.pdf
About Crusader Resources Limited
Crusader Resources Limited (ASX:CAS) is a minerals company focussed on the identification, acquisition, development and operation of projects in Brazil. Crusader believes that Brazil is a vastly underexplored country with high potential for the discovery of world class mineral deposits. The company has already acquired a diverse portfolio of projects including gold, iron ore, tin, tungsten and uranium and continues to utilise its strong networks in Brazil to identify new opportunities.
Crusader is characterised by a tight corporate structure and features an experienced board of directors who are strongly focussed on the success of the company.
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