The Juruena Gold Project (> 400km2 of contiguous tenements, 100% Crusader owned) is located in Central Brazil in the state of Mato Grosso, 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 the1980s, producing an estimated 500koz.
The project has two advanced key project areas, Juruena and Novo Astro.
- 500koz historical production with a 20,000 strong garimpeiro workforce at the peak during the 1980’s
- Hosted in a magmatic arc terrain (2.24-1.6Ga), a well-defined host of significant gold deposits globally
- 7 confirmed zones of mineralisation – Querosene, Dona Maria, Crentes, Capixaba, Tomate, Uiliam, Mauro
- 4km wide circular soil anomaly that has never been drilled
The Alta Floresta Gold Province, highlighting gold occurrences and Crusader project
Crusader acquired 100% of the project in July 2014. The acquisition included:
- Incumbent skilled local site team
- Full camp and established infrastructure – Permanent offices, core shed, 1,000m airstrip, dormitories & kitchen facilities
- Extensive high quality exploration database
The Juruena mineralisation is considered to have resulted from magmatic activity (intrusions and fluids) which could be sourced from a gold porphyry system or intrusive-related gold system, whilst still containing characteristics commonly associated with epithermal systems. The mineralisation is hosted by Paleoproterozoic volcanic and granitoid rocks of varying composition. The host rocks are found within the Juruena-Rondonia block of the Amazon Craton.
Since acquiring 100% of the project in 2014, Crusader has completed a 10,000m diamond and RC drilling program leading to the estimation of Maiden JORC Resources for three key prospects, Querosene, Dona Maria and Crentes. The maiden resource estimated a total of 1.3Mt @ 5.6 g/t for 234koz Au over the 3 key prospects. A full table of the resources at different cut-offs is given below.
JORC (2012) compliant mineral resource estimate for Juruena project, September 2015 Note: Appropriate rounding applied. For further information, please see the section below: Summary of Resource Estimate and Reporting Criteria.
The Querosene prospect is located on the eastern end of the Juruena project area and was the first prospect targeted in the Crusader drilling program due to consistent high‐grade drilling results from previous explorers. Results from Crusader’s 2014/15 drill campaign confirmed and expanded on these results (including 2m @ 32.97 g/t gold from 84m in hole QR‐20 and 3m @ 26.35 g/t gold from 73m in hole QR‐03) and their continuity has allowed independent consultants to estimate a JORC compliant mineral resource of 263,500t at 12.3 g/t for 104,100oz Au.
Mineralisation is divided into 4 main zones, with the majority of the higher grades and ounces contained in the SE and Main zones. Mineralisation at Querosene is open to the South and at depth, with several areas on the main zone and SE zone presenting obvious drilling targets which could have immediate and significant impact.
The mineralisation is associated with narrow shear zones, quartz vein and minor sulphides. Mineralisation intercepts (downhole) normally vary between 1-4m in width, with narrow, non-magnetic dolerite dykes often associated.
Results for metallurgical testing on samples from the Querosene prospect indicate recoveries of > 90% for both gold and silver using standard leaching. Results also indicate the gold and silver are free milling and well distributed within the ore.
Dona Maria Prospect
Dona Maria is located adjacent to the Crentes prospect, approximately 1km along the Juruena fault zone from Querosene. Mineralisation at Dona Maria appears to ‘splay away’ from the main Juruena fault (WNW) toward the NNW.
Querosene, Crentes and Dona Maria prospects shown relative to each other
Independent consultants have estimated a JORC compliant mineral resource at Dona Maria of 196,300t @ 11.8 g/t for 74,700oz Au (using a 2.5g/t lower cut and a 60 g/t top cut).
Metallurgical testwork at the Dona Maria prospect recovered +90% gold in standard leaching tests, with a significant portion (25-30%) reporting to a gravity concentrate. Recently, flotation testwork at both Dona Maria and Querosene has returned comparable results to leaching, indicating this may also be a viable process route.
Mineralisation at Crentes appears to be associated with sheeted quartz and sulphide veins (pyrite, +/- chalcopyrite) which are exposed in a shallow garimpo working. The garimpo pit is approximately 400m long (oriented WNW) and up to 40m wide. The mineralised trend is associated with the Juruena fault zone, a regionally extensive feature which is generally unmineralised and along strike from the Querosene prospect.
Crentes is a lower grade prospect than Querosene or Dona Maria, however it has the advantage of being broad and near-surface. Crentes has reported a potentially open-pittable resource of 846kt at 2.0 g/t for 55koz.
For the most up to date information on the Juruena Gold Project, please go to our ASX Releases page.
The information provided on this site is of a general nature only. Although it has been prepared in good faith with all due care there can be no guarantee that it will continue to be accurate in the future. No one should act or rely upon the information but should undertake their own independent due diligence or seek appropriate professional advice. To the extent permitted by law Crusader Resources Limited (“Crusader”) excludes all liability from any statement in, or omission from, this report. Nothing in this report should be construed as either an offer to sell or a solicitation of an offer to buy or sell Crusader securities in any jurisdiction.
Competent Person Statement
The information on this website that relates to Juruena Gold Project exploration results, Posse Iron Ore Project exploration results and Borborema Gold Project exploration results released after 1 December 2013, is based on information compiled or reviewed by Mr Robert Smakman who is a full time employee of the company and is a Fellow of the Australasian Institute of Mining and Metallurgy, and has sufficient experience that is relevant to the type of mineralisation and type of deposits under consideration to qualify as a Competent Person as defined in the 2012 edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves. Mr Smakman consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.
The information on this website that relates to:
- Borborema Gold Project and Posse Iron Ore Project Exploration Results released prior to 1 December 2013 is based on information compiled or reviewed by Mr Robert Smakman who is a full time employee of the company;
- Borborema Gold Mineral Resources is based on information compiled by Mr Lauritz Barnes and Mr Brett Gossage, independent consultants to the company;
- Borborema Gold Ore Reserves is based on information compiled by Mr Linton Kirk, independent consultant to the company;
- Posse Fe Mineral Resources is based on and accurately reflects, information compiled by Mr Bernardo Viana who is a full time employee of Coffey Mining Pty Ltd,
and who are all Members of the Australasian Institute of Mining and Metallurgy (Rob Smakman and Linton Kirk being Fellows), and who all have sufficient experience that is relevant to the type of mineralisation and type of deposit under consideration, and to the activity which they are undertaking to qualify as a Competent Person as defined in the 2004 edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves. Each of Mr Smakman, Mr Lauritz Barnes, Mr Kirk, Mr Viana and Mr Brett Gossage consent to the inclusion in the report of the matters based on their information in the form and context in which it appears.
This information was prepared and disclosed under the JORC Code 2004. It has not been updated since to comply with JORC Code 2012 on the basis that the information has not materially changed since it was last reported.