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Progress Update

30 Apr 2012 07:00

RNS Number : 2745C
Orogen Gold PLC
30 April 2012
 



Orogen Gold Plc

('Orogen' or 'the Company')

 

Progress Update

 

 

 

Orogen Gold Plc (AIM:ORE), the AIM listed mineral exploration company focussed on Gold exploration and development in eastern Europe, provides the following progress update on the results of the underground mapping and sampling exploration programme, at the Deli Jovan project in eastern Serbia.

 

The Company has completed its geological and structural mapping campaign at the historic Gindusa and Rusman gold mines and has received gold assay results from its underground channel and grab sample programme.

 

Highlights

 

·; Very high gold grades up to 1m@ 63.4g/t Au confirmed from underground channel sampling at the Gindusa mine

·; Four gold-bearing mineralised structures identified at Gindusa in an 80m wide shear corridor, including one not previously known

·; Selected chip samples at Gindusa as high as 133g/t Au

·; Mineralised zones at Gindusa remain open along strike and down dip

·; Two gold target zones identified at Rusman, with underground grab samples assaying up to 82.5g/t Au

·; Targets at both historic mines untested by drilling to date, leaving scope for discovery of significant extensions to the previously mined zones. Drilling contract due to be signed imminently

 

 

Mapping of the underground workings at Gindusa and Rusman has confirmed that much of the mine development has followed a series of faults containing complex anastomosing gold-bearing quartz-pyrite veins within a larger shear system. It is apparent from mapping of the workings that the bulk of historic production was from the Gindusa mine.

 

Four mineralised quartz vein structures at Gindusa have been mapped in the underground workings. These are sub-parallel, trending NW-SE, dip from near vertical to steeply to the NE and they occur within a shear corridor at least 80m wide. High grade gold-mineralised quartz-pyrite veins and lenses occur as pinches and swells along the fault structures, with individual lenses up to 30m in horizontal extent and 60m+ in vertical extent. Typically these are 30-70 centimetres in width, up to in excess of 1m locally.

 

In order to meet strict safety requirements during the refurbishment of the underground workings completed by Orogen, the mining contractor was required to timber off access to open workings. Sampling was therefore generally confined to the peripheral parts of the vein systems and as a result, it is probable that sampling by Orogen does not disclose the full extent of the higher grade lenses and shoots that were mined historically. Nevertheless, from a total of 137 rock chip/channel samples collected, assay results confirmed the presence of very high grade values in the Gindusa vein system, ranging from trace gold up to 63.4g/t Au over 1m width in channel sampling and up to 133.0g/t Au in more selective chip sampling, as detailed in Table 1 below:

 

 

Table 1

Gindusa mine - all chip-channel sample results >5g/t Au

Mine level

Vein No.*

Sample width (m)

Au grade (g/t)

Sample type

1

1

1.0

7.5

Channel sample

2

1.0

63.4

Channel sample

2

1.0

6.9

Channel sample

2

1.0

46.6

Channel sample

2

2.0

6.5

Channel sample

3

0.8

18.7

Channel sample

4

0.5

12.2

Channel sample

2

-

68.0

Selective chip sample

3

-

73.4

Selective chip sample

2

1

1.0

10.2

Channel sample

1

1.0

20.5

Channel sample

1

1.0

5.4

Channel sample

2

1.0

16.7

Channel sample

3

1.0

17.1

Channel sample

3

0.8

9.3

Channel sample

3

1.0

8.0

Channel sample

3

0.8

9.3

Channel sample

1

-

133.0

Selective chip sample

3

-

9.0

Selective chip sample

3

-

58.8

Selective chip sample

*Veins are numbered 1-4 in sequence from NE to SW

 

At Rusman the reopening work completed by Orogen has shown that considerable historic underground development took place, although actual mining was more limited than at Gindusa. On Level 1, 28m below surface, Orogen reopened access to more than 300m of drives which follow the NW-SE strike of a significant fault. Previous mining was focussed on two mineralised quartz vein zones at either end of the level. Again access for sampling of these zones was restricted by the need to timber off zones of open stopes. The NW mineralised zone lies close to an underground exploration adit previously sampled by our JV partners, Reservoir Minerals, where selective grab sampling of collapse material returned assay values ranging from 0.6 to 98.8g/t Au. At the SE end of the Level 1 drive, where sampling was possible outside of timbered areas, four channel samples within a mineralised quartz vein averaged 6.0g/t Au over an average width of 0.9m along a 5m length of the vein. A selective grab sample taken from a small area of open workings in quartz/pyrite assayed 82.5g/t Au.

 

 

Chief Executive of Orogen Gold Plc, Ed Slowey, commented:

 

"The results of Orogen's underground mapping and sampling programme confirm the presence of very high grade gold mineralisation at both Gindusa and Rusman, with greater continuity of mineralised structures at Gindusa and development of multiple quartz veins within an 80m wide corridor.

 

Clearly the results warrant a substantial diamond drilling programme focussed on the higher grade and more continuous gold shoots at Gindusa, as well as the wider shear zone containing multiple mineralised vein systems. The sampling results of remnant and residual mineralisation are strongly encouraging and the information gained will be used to direct the drilling programme which will aim to confirm continuity of the mineralised lodes. This programme will commence very shortly and I look forward to reporting further positive results to shareholders over the coming months."

 

Further Information

 

Mapping of the underground workings at Gindusa and Rusman has confirmed that much of the mine development has followed a series of faults containing complex anastomosing gold-bearing quartz-pyrite veins within a larger shear system. It is apparent from mapping of the workings that the bulk of historic production was from the Gindusa mine.

 

Ginduša Mine

 

Mine development took place predominantly during the late 19th to early 20th century along two main levels at 30 and 60m depth, with limited shaft development to 80m. Four mineralised fault structures have been mapped on Level 1 (30m depth). These are sub-parallel, trending NW-SE, dip from near vertical to steeply to the NE and they occur within a shear corridor at least 80m wide. On Level 2 (60m depth) development follows three of the fault structures. In total 250m of galleries are developed along mineralised fault/vein structures on Level 1 and 200m on Level 2. At least one of the fault/vein structures (Vein 2) appears to be mined semi-continuously from surface to 80m depth and may be open below this depth. Some of the mapped veins are also open along strike in the underground workings and no drilling has previously been carried out to test the vertical and lateral extensions of the vein systems. Surface soil sampling has suggested possible extensions to the Gindusa gold lodes towards the SE.

 

High grade gold-mineralised quartz-pyrite veins and lenses occur as pinches and swells along the fault structures, with individual lenses up to 30m in horizontal extent and 60m+ in vertical extent. Typically these are 30-70 centimetres in width, up to in excess of 1m locally.

 

In order to meet strict safety requirements during the refurbishment of the underground workings completed by Orogen, the mining contractor was required to timber off access to open workings to avoid the risk of falling rocks from the old stopes overhead. Sampling was therefore generally confined to the peripheral parts of the vein systems which were left behind by the old miners or where support pillars remained in place. Samples were taken as continuous chip/channels across the mineralised zones where these were accessible or, occasionally, as grab or selective chip samples where access was restricted.

 

Assay results ranged from trace gold up to 63.4g/t Au over 1m in channel sampling and up to 133.0g/t Au in more selective chip sampling, as detailed in Table 1 above. Some samples are also anomalous for copper and, rarely, lead/silver. Chalcopyrite (copper iron sulphide) mineralisation was observed in a number of samples, assaying from trace up to 0.94% Cu.

 

 

Rusman Mine

 

At Rusman the reopening work completed by Orogen has shown that considerable historic underground development took place, including construction of a substantial shaft and driving of more than 1.2km of adits and cross-cuts on three levels. On Level 1, 28m below surface, Orogen reopened access to more than 300m of drives which follow the NW-SE strike of a significant fault which dips generally at 50-55 degrees to the NE, steepening to near-vertical towards the SE end of the drive.

 

Geological mapping and chip/channel sampling totalling 188 samples confirm that most of the length of this structure is not gold-bearing. However there is evidence of mining of pyritic quartz lenses inclined towards surface along the fault structure at both ends of the drive. Again access for sampling of these zones was restricted by the need to timber off zones of open stopes. At the NW end of the drive no sampling of the quartz-pyrite zone was possible, but the development lies close to the old Rusman exploration adit, where previous grab sampling returned assay values ranging from 0.6 to 98.8g/t Au. A number of old Roman surface workings or 'pingas' align here with the underground workings, suggesting at least 30m of vertical continuity along the mineralised zone.

 

At the SE end of the Level 1 drive, where sampling was possible outside of timbered areas, four channel samples within a mineralised quartz vein averaged 6.0g/t Au over an average width of 0.9m along a 5m length of the vein. A selective grab sample taken from a small area of open workings in quartz/pyrite assayed 82.5g/t Au. The largest surface 'pingas' at Rusman overlie this zone at surface and to the SE beyond that part of the Level 1 drive that could be safely accessed, suggesting that this zone may extend along strike for a further 50-60m to the SE.

 

Little mine extraction appears to have taken place on the lower two levels at Rusman. Most of the development is oriented NE-SW across the strike of the main structure, apparently developed as exploration drives.

 

Again, no exploration drilling has taken place at Rusman. The two zones of interest at either end of the Level 1 drive show signs of only small scale investigation below the 28m level and were not tested by the lower two levels at the mine. These zones remain potential drill targets for Orogen, although a lesser priority than Gindusa.

 

 

Sampling, Assaying, and Quality Assurance / Quality Control

 

Orogen's underground bedrock sampling conforms to industry-wide good practice, with chain of custody being observed for all samples. Gold analysis is undertaken by ALS Chemex at its laboratory in Romania and the Company maintains QA/QC on all analytical work via the use of certified reference materials, field duplicates, and blank samples in addition to monitoring of internal laboratory check-analyses.

 

Ed Slowey, CEO of Orogen is a Competent Person as defined by various international instruments and takes responsibility for the release of this information.

 

 

-Ends-

 

Orogen Gold Plc

Ed Slowey, CEO

Alan Mooney, FD

Website: www.orogengold.com

 

 

+353 1662 8395

 

 

Zeus Capital Limited

Nominated Adviser and Joint Broker

Ross Andrews/Tom Rowley

 

 

 

+44 (0)161 831 1512

XCAP Securities Plc

Joint Broker

Jon Belliss

 

 

 

+44 (0) 207 101 7070

Newgate Threadneedle

Financial PR

Guy McDougall/ Josh Royston/ Terry Garrett

 

 

+44 (0) 207 653 9850

 

 

 

Notes to Editors

 

The Deli Jovan gold project is in eastern Serbia, the site comprising two shallow underground gold mines at Rusman and Gindusa, about 6 kilometres apart along a major shear zone, that were last in production over seventy years ago.

 

This information is provided by RNS
The company news service from the London Stock Exchange
 
END
 
 
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