Burns drilling encourages Octagonal

THE DRILL SERGEANT: Octagonal Resources has received results from a recently completed infill aircore drilling program carried out at the Burns prospect, located within the company’s Hogan’s project in Western Australia, which the company said have defined two zones of gold.
Octagonal considers the Burns prospect to be a priority exploration target area that it is advancing through infill and extensional aircore drilling with the objective to define targets for bedrock drill testing.

The aim of the recently completed aircore drilling program was to enable the company to better define distribution of gold in regolith (weathered Archaean bedrock) anomalism.

Drilling was carried out using an 80 metre by 320 metre spaced grid and consisted of 101 holes, totalling 5,689 metres.

This was the first of two phases of infill aircore drilling the company is to undertake and that has been designed to eventually test the area with a 40m by 160m spaced grid to allow for targeted bedrock drilling.

Assay results of note from this drilling program included:

–    6 metres at 0.61 grams per tonne gold from 78 metres;

–    8m at 1.22 g/t gold from 80m;

–    4m at 0.55 g/t gold from 71m;

–    7m at 0.73 g/t gold from 82m;

–    6m at 0.20 g/t gold from 20m;

–    4m at 0.38 g/t gold from 42 metres to the end of hole;

–    8m at 0.29 g/t gold from 20m; and

–    2m at 0.89 g/t gold from 83m.

These results follow others released by Octagonal in May, which intersected zones of gold anomalism during regional aircore drilling using a 160m by 640m spaced grid.

These results included:

–    23m at 0.5 g/t gold from 18m to the end of hole;

–    12m at 0.3 g/t gold from 68m to the end of hole;

–    3m at 0.9 g/t gold from 44m; and

–    2m at 0.6 g/t gold from 63m to the end of hole.
“The gold results already intersected at Burns prospect are wider, higher grade, and more broadly distributed that those that led to the discovery of the Salt Creek Deposit, even though the drill hole spacing is also wider,” Octagonal Resources said in an announcement to the ASX.

“These observations further support the potential of the Burns Prospect to host a significant gold deposit.”

The company said it was highly encouraged by the latest results and will continue infill and extensional aircore drilling with the objective of refining gold in regolith anomaly targets for 2012.

It has already secured a land aircore rig for the second phase of infill drilling during October using a 40m by 160m spaced grid.

A lake aircore rig has also been booked to test for gold in regolith anomalism extending under the salt lake.

The lake aircore drilling program will commence as soon as an appropriate drill rig becomes available.

Gryphon Minerals sharpens Stinger

THE DRILL SERGEANT: West Africa-focused gold play Gryphon Minerals has received encouraging results from an initial round of RC and diamond drilling on its new Stinger discovery located only 10 kilometres to the east of the Nogbele gold deposit and planned processing plant, at the company’s Banfora gold project in Burkina Faso.

Gryphon said the drill results show, “Stinger has the potential to be a significant new discovery similar to the other Gryphon Minerals gold discoveries of Nogbele, Samavogo and Fourkoura at the Banfora gold project”.

“We are really excited by these initial drill results from our new Stinger target, highlighting multiple stacked zones of shallow mineralisation that remain open along strike and at depth,” Gryphon Minerals managing director Steve Parsons said in the company’s announcement to the Australian Securities Exchange.

“We continue to see the benefits in 2011 of our aggressive $30 million exploration program, with a maiden resource previously announced at the Samavogo deposit and now exciting drill results from the new Stinger discovery, which again further illustrates the high prospectivity of the district and potential for further new discoveries at the Banfora gold project.”

The initial drilling Gryphon has carried out at the Stinger prospect has been shallow, targeting gold less than 100 meters vertical depth on a new and previously untested north‐east trending zone several kilometres to the east of the current gold deposits at the Banfora project.

“Mineralisation occurs as multiple stacked zones, associated with silica flooded and albite altered hematite dusted intrusive with fine grained disseminated pyrite and pervasive sericite alteration with occasional minor milky veins and visible gold,” the company said.

Drilling to date has tested just two kilometres strike of a major regional shear zone that remains open along strike and down dip.

Gryphon is now undertaking a detailed drill RC and DD program that is expects will move Stinger from discovery to a potential resource estimate in as soon a time frame as possible.

The company has also identified a further 20 high priority regional targets that it has earmarked for systematic testing by reconnaissance style RAB and auger drilling throughout the rest of this year and into the next.

Gryphon recently announced a preliminary independent engineering study for the Banfora project and is now undertaking detailed feasibility studies on a 3.5 million tonne per annum open pit operation with a central processing plant located at the Nogbele deposit.

Gryphon anticipates that with further drilling and potential resource growth it will eventually be able to incorporate the new Stinger discovery into the detailed feasibility studies.

Sheffield scores at Irwin

THE DRILL SERGEANT: Bulk minerals explorer Sheffield Resources has received results from a 31 hole drilling program at its Irwin heavy mineral sand (HMS) project located 80 kilometres southeast of the port of Geraldton in the Mid West region of Western Australia.

Sheffield said the latest drill results from Irwin, combined with results of drilling carried out by North Mining in 1994 to confirm the presence of a large 1.5 kilometre to 2.5 kilometre wide zone of low grade dunal-style mineralisation.

The company has also increased the strike length of the zone to 5km.

Noteworthy drilling results from the drilling include:

–    18.0 metres at 1.25 per cent heavy mineral from 6.0 metres;

–    13.5m at 1.40% HM from 7.5m;

–    15.0m at 1.66% HM from 4.5m;

–    12.0m at 1.70% HM from 7.5m; and

–    9.0m at 2.58% HM from 25.5m.

Sheffield Resources managing director Bruce McQuitty said the drill results outlined a large open-ended dunal mineral sands system in an area that has received little previous exploration.

“The Irwin project represents a large virgin exploration target, strategically located close to infrastructure and adjacent to Tiwest’s Dongara deposit,” McQuitty said in the company’s announcement to the Australian Securities Exchange.

“It is one of several projects that Sheffield is advancing in the world class North Perth Basin mineral sands province.”

Mineralisation identified by the latest drilling campaign averages 10m in thickness but is locally up to 18m thick at 1% HM cut-off.

It is variably overlain and enveloped by a halo of lower grade (0.5-1% HM) mineralisation.

Sheffield indicated that an important feature of the dunal mineralisation is the low slimes content (weighted average 6.4%) and low oversize (3.0%), which favour low cost processing techniques.

The Irwin project is situated 60km north of Eneabba in what Sheffield describes as a, “highly prospective setting on the Swan Coastal Plain at the foot of the Gingin Scarp”.

Sheffield recently applied for an additional Exploration Licence (ELA70/4189) which extends the Irwin exploration target for an additional 10km to the north.

The results follow the company’s announcement last month of its maiden resource at its nearby Yandanooka project of 1.84 million tonnes of contained heavy mineral within a total resource of 71.75 million tonnes at 2.6 per cent heavy mineral, comprising 61 million tonnes at 2.8 per cent heavy mineral (Indicated) and 10.75 million tonnes at 1.1 per cent heavy mineral (Inferred).