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Coziron reports geological setting of high-grade gold discovery at Croydon

Coziron Resources Limited (ASX: CZR) has announced an encouraging update on its Croydon Top Camp gold project in WA.

The company reported that a regional geological review together with follow up geochemistry results from Top Camp confirms the Tabba Tabba shear zone provides a structural link between Top Camp, where CZR recently intersected 8m @ 10.2 g/t gold, including 1m @ 66.1 g/t and the new high-grade Hemi gold discovery.

CZR said that its review indicates the gold deposits in the Mallina Basin region share features with other major intrusion-related gold provinces in the North American Cordillera, North China Craton, Tian Shan of Western China and Central Asia.

The company reported that it is planning follow-up drilling at Top Camp and its other highly prospective emerging large-scale gold prospects on E47/2150.

Croydon top-camp gold project

The Croydon Top-Camp Gold Project is located 70 km south-east of Karratha and 40 km south of a gold processing plant at Whim Creek.

Croydon’s geological setting has Fortescue Basalt unconformably overlying folded meta-sediments of the De Grey Super-basin adjacent to granites with lithium pegmatites.

There are multiple drill ready targets. Middle Valley has gold bearing veins requiring follow-up and drilling, while Golden Valley and Bottom Camp have extensive prospector activity requiring follow-up.

The project contains shear-zone gold in De Grey Super basin, and has Top Camp accessible, large-scale, drill-ready gold, arsenic, and antimony soil anomalies. The project also has prospectivity for gold in outliers of basal conglomerate from the Fortescue Group.

Drilling at Top Camp

The company had recently completed drilling programme at Top Camp. The 200 m deep, RC drill-holes inclined at -60° were sampled on 1 metre intervals.

High-grade assays reported

The company had announced high-grade assay results from the drilling programme at Top Camp.

Drill hole CRC007 reported 8 m @ 10.2 g/t which included 1 m @ 66.1g/t while CRC009 has 7 m @ 1.4g/t including 1 m @ 7.7g/t in CRC009. Hole CRC012 had a broad 19m @ 0.6g/t.

Coziron said that it has now received full-suite whole-rock XRF and trace-element ICP data for CRC004, CRC007, CRC009, and CRC012.

Regional geological review

CZR reported that following the announcement of the high-grade gold intercepts by De Grey from the Hemi Prospect, a review of the available regional geology and geophysics was done at Croydon.

Tabba Tabba zone a structural link

The company said that the review of the available regional geology and geophysics suggests that the NE-trending Tabba Tabba Shear Zone represents a major structure that divides terrains in the basement of the Pilbara. It also appears to control the areas and types of sediments in the Mallina Basin and the localisation of later stage grainitic intrusions.

CZR noted that much of the Mallina Basin is covered by a veneer of outwash and sand but better outcropping areas along some of the major structures associated with the Tabba Tabba system are contributing to a growing inventory of gold resources.

The company said that the prospectivity along the structure is increasing by the drill-discovery of high-grade intercepts at Hemi and Top Camp.


At the Top Camp prospect on E47/2150, surface samples overlying calcareous turbidites in the Mallina Basin covering an area of about 400m by 1.5km had reported high-tenor anomalism in gold with arsenic, antimony and tungsten.

The recently completed 13-hole RC programme had intercepted a number of zones with gold mineralisation.

Trace-element association

The company reported that the down-hole full-suite geochemistry obtained for four of the 13 holes shows that the intervals of elevated gold are strongly correlated with significantly higher tungsten, Sulphur and antinomy, and traces of thallium, molybdenum, and bismuth.

CZR said that the gold and gold-associated pathfinder elements are enclosed by a broader halo of arsenic-rich rocks.

The company noted that the trace-element association suggests that the gold-bearing fluids were derived from an intrusion-related source and indicates a potential genetic link to the granitic intrusion that hosts the gold-mineralisation being drilled by De Grey mining at the Towerana deposit.

The company reported that the 30 km distance between Top Camp and the Towerana deposits also opens an opportunity for prospectivity over a broader area of E47/2150 and this is being reflected by geochemical anomalism in reconnaissance surface samples being collected by CZR.

CZR reported that the new structural framework derived from an interpretation of the regional geological and magnetic data also shows that most of the gold occurrences on the Top Camp tenement are proximal to major splays from the Tabba Tabba Shear zone.

However, on the eastern block of E47/2150 much of the prospective corridors is covered by a veneer of alluvial cover and shallow drilling may be required to determine the potential for mineralisation.

Features similar to other major intrusion-related gold province

The company reported that the geochemical and geological evidence for an intrusion-related origin of the gold mineralisation in the Top Camp region now provides a model for exploration and allows comparisons with other well described areas and deposits in the Cordilleran Belts of Alaska and Canada, along the northern margin of the North China Craton and the Tian Shan Belt of Western China and Central Asia.

What’s next?

The company reported that further work includes diamond drilling to provide down-hole structural data to compliment surface geology and infill and extensional RC drilling to better define the extent and tenor of mineralisation.

Management comments

CZR chairman Adam Sierakowski said: “The follow-up geochemistry on the high-grade intersection in CRC007 and other encouraging intercepts from the Company’s maiden drill program at Top Camp provides a framework to compare the style and setting of mineralisation in the regional geology with other global intrusion-related gold provinces.

The Company has also identified structural links between the new high-grade gold discovery at Hemi and other significant sites of gold mineralisation in the Mallina Basin, including Top Camp and is accelerating plans for further drilling and exploration to expand on the current Croydon drilling success.”

Written By Jonathan Norris
Jonathan is a founder of and has been covering the resources industry since 2018. With over 17 years experience in print, broadcast and online media, Jonathan has seen first hand the transformative effect of online niche media.