Further to the announcement of 7 November 2017, Greatland Gold plc (AIM:GGP), the precious and base metals exploration and development company, is pleased to announce the results from ground gravity and Mobile Metal Ion (“MMI”) surveys recently conducted at Greatland’s Paterson project.
· Ground gravity survey results at Havieron indicate a larger than expected north-west structural trend, an outcome which is mirrored by the results of the MMI survey;
· An elevated MMI response in pathfinder elements (cerium, lanthanum, uranium and lead) to the immediate south-east of Havieron suggests primary basement mineralisation may be present along strike for up to 1.5 kilometres;
· Results indicate that the peak gravity response at Havieron has not been tested by historical drilling;
· Gravity results from Scallywag show gravity highs co-incident with the magnetic targets over approximately 2km of strike.
The Paterson project covers more than 385 square kilometres in the Paterson region of Western Australia and includes the Havieron licence, the Paterson Range East licence, and the recently acquired Black Hills licence. Limited historical drilling was conducted by Newcrest at Havieron during the 1990s where six holes were drilled, all of which intersected significant alteration and gold plus copper anomalism. Thick lower grade zones of gold and copper have been intersected and gold grades within these peak at 15.4g/t and copper to 2.5%. The Scallywag target hosts several magnetic anomalies over an area of approximately 6km by 4km with potential to host gold and/or copper mineralisation.
Gervaise Heddle, Chief Executive Officer, commented:“The MMI and gravity survey results indicate that the Havieron target may be significantly larger than we previously expected. Results of both surveys suggest that historical drilling by Newcrest at Havieron may have only intersected a small part of a potentially large, north-west trending mineralised system that may extend for up to 1.5 kilometres. Moreover, certain pathfinder elements detected by the MMI survey support our view that Havieron is an Iron Oxide Copper Gold (“IOCG”) system.
“We are very pleased with the gravity and MMI results at Havieron, and believe that these low-cost techniques can be deployed next year to screen the multiple prospective regional IOCG targets previously identified by Greatland (see announcement dated 17 August 2017).”
A regional map showing the Havieron and Paterson Range East licences with regional targets and adjacent landholdings can be found at: http://greatlandgold.com/paterson/
Overview of Paterson Project (Havieron, Paterson Range East and Black Hills)
The Company’s Paterson project comprises the Havieron and Paterson Range East licences, and the Black Hills licence, located in the Paterson region of northern Western Australia. The three licences collectively cover more than 385 square kilometres prospective for iron-oxide-copper-gold (“IOCG”) deposits and Telfer style gold deposits.
The Paterson region hosts several large gold and copper deposits such as Telfer (27m oz) and Nifty (2m tonnes copper). The region has been subject to more recent exploration which has outlined several other deposits including Magnum (Au), Calibre (Au), O’Callaghans (Cu) and Maroochydore (Cu).
The region is remote, however infrastructure is good with several operating mines, roads, formed tracks and rail networks nearby which branch out from the regional industrial hub of Port Hedland 500km to the west.
The Paterson Province is the northern portion of the Proterozoic Paterson Orogen. More recent exploration throughout several Proterozoic Orogens within the western parts of the Australian continent has resulted in the discovery of the large Tropicana gold deposit (7.9m oz) and the large Nova nickel-copper deposit (10m tonnes). Globally these Proterozoic Orogens are highly prospective for large deposits, and are often under-explored.
Alteration and mineralisation of those targets which have been drill tested at Havieron and Paterson Range East display similarities to IOCG-type deposits. Examples of these are the large Olympic Dam and Ernest Henry deposits in central and eastern Australia.
Geophysical data has outlined the Havieron target as covering approximately 1,000m x 1,000m. Depth to top of target is around 400m with these depths easily achieved with modern drilling equipment. Only six drill holes have been completed to date, all of which intersected significant hematite alteration and gold, plus copper anomalism. Thick lower grade zones of gold and copper have been intersected and gold grades within these peak at 15.4g/t and copper to 2.5%. Current drill hole spacing is broad and the core of Havieron therefore represents an immediate resource definition drilling target.
Following a review of regional geophysical and geochemical data over the Paterson project approximately fifty IOCG targets have been identified in the broader region, with around half in ground held by Greatland. The setting of these licences is on the western margin of a Proterozoic basin which ranges in depth from less than 100m below surface to more than 400m below surface. Basement rocks of the basin are predominantly calcareous rich sandstones intruded by several late stage granitic bodies exploiting basin margin faults which have also provided a focus for ore fluids. Historically, several of these targets have been subject to initial first-pass work and show promise at hosting mineralisation as seen at Havieron. The geophysical signature of these targets is very similar to that at Havieron. Basement rocks do not outcrop and Greatland intends to employ modern geophysical and geochemical methods to define targets prior to drill testing. The Scallywag target was identified from this regional review and hosts several magnetic anomalies over an area of approximately 6km x 4km with potential to host gold and/or copper mineralisation.
The Black Hills licence, E45/4512, lies 30 km east of the large Telfer gold mine (27m oz). Black Hills is a granted exploration licence that covers 25 square kilometres and sits adjacent to the Company’s Havieron exploration licence. The Black Hills licence is regarded as having high potential to host further gold deposits similar to Telfer. There has been a reasonable amount of historical exploration work at Black Hills with several discrete zones of mineralisation identified over 5km of strike. Rock chip samples have returned up to 90g/t gold, and commonly 20g/t gold, with free (visible) gold in places. Drill intercepts include 4m at 7.0g/t from 25m, 5m at 2.3g/t from 25m, 2m at 3.4g/t from 23m and 2m at 1.29g/t from 10m. Historical drill spacing appears quite broad with holes at least 400m apart, some up to 600m.
Gold prospects identified to date extend from Black Hills into the north western parts of the Havieron licence. Proterozoic sandstone and carbonate rocks of the Yeneena Group formations are present, including the Telfer Formation, in a domal structure which is the equivalent geology to that of the large Telfer gold deposit (27m oz) located 30km to the west.
Prospectivity of the Paterson Province is widely recognised with several large industry participants present. These include Rio Tinto, Newcrest and Antipa. Greatland’s licences lie adjacent to Rio Tinto and Antipa.
MMI sampling and ground gravity over the Havieron target has been completed at an initial sample and station spacing of 200m x 200m. Additionally ground gravity has been completed over the Scallywag target at a station spacing of 400m x 200m. Results of ground gravity and MMI work at Havieron has outlined several targets for a 2018 drill campaign with the peak gravity response not tested by existing drilling. Gravity confirms a NW structural trend of basement carbonate sediments which is mirrored by the surface MMI response. Clusters of elevated gold, silver, arsenic, copper and iron in MMI results are proximal the peak co-incident gravity and magnetic response. An elevated MMI response in pathfinder elements (cerium, lanthanum, uranium and lead) to the immediate SE of Havieron suggests primary basement mineralisation may be present along strike in a structural contact for up to 1.5 kilometres. Peak MMI responses over Havieron were 4ppb silver, 70ppb arsenic, 25ppb gold, 834ppb cerium, 710ppb copper, 53ppm iron, 284ppb lanthanum, 860ppb lead and 112 ppb uranium. Elevated pathfinder elements detected by the MMI survey support our view that Havieron is an Iron Oxide Copper Gold (“IOCG”) system. Gravity results from Scallywag show gravity highs co-incident with the magnetic targets over approximately 2km of strike. Gravity and MMI results have been deemed satisfactory and can be cost effectively deployed to screen the many other prospective regional targets identified by Greatland (as announced 17 Aug 2017).
Additional information on the Havieron, Paterson Range East and Black Hills licences can be found on the Company web site at www.greatlandgold.com/projects
Information in this announcement that relates to exploration results is based on information compiled by Mr Callum Baxter, a director of Greatland Gold plc, who is a member of the Australasian Institute of Mining and Metallurgy and Australian Institute of Geoscientists. Mr Baxter has sufficient experience relevant to the style of mineralisation and type of deposit under consideration and to the activity which has been undertaken to qualify as a Competent Person as defined by the 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (the JORC Code) and under the AIM Rules – Note for Mining and Oil & Gas Companies. Mr Baxter consents to the inclusion in the announcement of the matters based on their information in the form and context in which it appears.
All information is provided on an as-is basis. Where we allow Bloggers to publish articles on our platform please note these are not our opinions or views and we have no affiliation with the companies mentioned