Oromin Explorations drills 36 m of 1.5 g/t Au at OJVG

2011-08-17 14:17 ET – News Release

Mr. Chet Idziszek reports

SUCCESSFUL INITIAL DRILLING RESULTS AT OJVG’S NEWEST DISCOVERY – MAMASATO and BEST DRILLING RESULT TO DATE AT SEKOTO

Oromin Explorations Ltd., on behalf of Oromin Joint Venture Group Ltd., has released additional drilling results from the continuing exploration program at the OJVG gold project in Senegal, West Africa. Results presented herein include initial drill holes completed at Mamasato, the most recent discovery at the OJVG gold project, and lateral and depth expansion drilling at the Kinemba, Sekoto and Saboraya discoveries.

Exploration drilling — gold discoveries and targets

Mamasato discovery

OJVG’s most recent gold discovery, Mamasato, is located approximately 4.5 kilometres north of the Golouma deposit and approximately two kilometres southeast of the centre of the Masato deposit. Mamasato is represented by an 800-to-1,000-metre-long, east-west-oriented gold-in-soil geochemical anomaly (more than 100 parts per billion gold) which is coincident with a series of north-northeast- and east-west-oriented quartz vein systems hosted by two or three subparallel sheared and altered zones within a package of mafic volcanics and felsic intrusive units. Mamasato is of compelling interest because it strongly resembles the Golouma deposit, both visually and structurally with the additional benefit of significantly greater depth of oxidation. Oxide depth averages 40 metres below surface and locally reaches 80-metre depths compared with oxide at Golouma which averages 10-metre depths. A key advantage of softer oxide mineralization at the OJVG gold project is in enabling greater throughput rates for the CIL plant. The following represents the most significant results from initial drilling and trenching at Mamasato:

• 2.86 grams per tonne gold over six metres (36 to 42) in DH-985;
• 2.64 g/t gold over five metres (40 to 45) in DH-987;
• 10.11 g/t gold over four metres (50 to 54) in DH-998;
• 3.58 g/t gold over five metres (63 to 68) in DH-1001;
• 2.78 g/t gold over 18 metres in TRX-357;
• 1.18 g/t gold over nine metres in TRX-360;
• 1.35 g/t gold over 15 metres in TRX-361.

To date, 28 drill holes have been completed at Mamasato testing the lateral extent of the alteration zone across a 650-metre strike extent and locally to approximately 250 metres downdip. Results presented above and in the accompanying table represent only a 220-metre strike extent of the currently known target. The Mamasato alteration zone remains open both along strike and to depth.

Sekoto discovery

The Sekoto discovery is located approximately nine kilometres northeast of the Golouma deposit and approximately four kilometres east of the Masato deposit. Sekoto has only recently become the focus of exploration drilling as a potential heap-leach deposit. Drill holes to date have now tested approximately 400 metres of strike length to depths of 100 metres downdip within thicker-than-usual oxide depths ranging between 50 and 75 metres below surface. Previously released results from Sekoto include 0.65 g/t gold over 23 metres and 1.67 g/t gold over 18 metres in RC-899. The following outlines the most recent significant results from Sekoto:

• 0.55 g/t gold over 12 metres (eight to 20) and 1.16 g/t gold over six metres in DH-996;
• 1.50 g/t gold over 36 metres (17 to 53) in DH-999.

The 36-metre intersection in DH-999 is entirely within the oxide zone and represents the best grade-thickness drilling interval received to date from this rapidly developing heap-leach potential deposit.

Previously announced results and complete interval breakdowns for the above-listed Sekoto drill holes are summarized in the accompanying table.

Kinemba discovery

The Kinemba discovery is located approximately five kilometres southwest of the Golouma deposit. At Kinemba, drilling to date has intersected zones of potential heap-leach gold mineralization along a minimum strike extent of 550 metres and locally to depths of approximately 200 metres. Previously released results from Kinemba include 2.16 g/t gold over 14 metres in RC-868 and 0.72 g/t gold over 25 metres in RC-889. The following outlines the most recent significant results from Kinemba:

• 2.09 g/t gold over five metres (107 to 112) and 1.66 g/t gold over seven metres (143 to 150) in DH-988;
• 1.07 g/t gold over eight metres (17 to 25) in RC-916;
• 0.76 g/t gold over 13 metres (12 to 25) in RC-917.

Previously announced results and complete interval breakdowns for the above-listed Kinemba drill holes are summarized in the accompanying table.

Saboraya target

The Saboraya target is very favourably located approximately midway between the Kerekounda and Kourouloulou deposits, and is similarly related to dilational shear-hosted quartz veining. Only limited drilling has been completed at Saboraya, testing a strike extent of only 150 metres and to depths of only 100 metres below surface. Previously released results from Saboraya include 8.91 g/t gold over five metres in RC-862 and 3.44 g/t gold over 23 metres in RC-911. The following outlines the most recent significant results from Saboraya:

• 2.84 g/t gold over 18 metres (zero to 18) and 1.55 g/t gold over 10 metres (155 to 165) in RC-912.

Previously announced results and complete interval breakdowns for the above-listed Saboraya drill hole are summarized in the accompanying table.

OJVG deposit resources

Based on the most recent resource update completed on behalf of the OJVG, utilizing drilling data to the end of 2010 and announced in Oromin’s new releases dated May 5, and May 12, 2011, the OJVG gold project hosts an indicated resource of 3,312,000 ounces of gold and an inferred resource of 430,000 ounces of gold, comprising the following:

• The combined Golouma, Kerekounda and Kourouloulou deposits host an indicated resource of 1.38 million ounces (12,748,000 tonnes grading 3.36 g/t gold) and an inferred resource of 180,000 ounces (1,404,000 tonnes grading 4.09 g/t gold).
• The Masato deposit hosts an indicated resource of 1,457,000 ounces (35,531,000 tonnes grading 1.28 g/t gold) and an inferred resource of 130,000 ounces (3,233,000 tonnes grading 1.25 g/t gold).
• The bulk-tonnage/heap-leach deposits host a current indicated resource of 475,000 ounces (20,606,000 tonnes grading 0.71 g/t gold) and an inferred resource of 120,000 ounces (7,046,000 tonnes grading 0.53 g/t gold).

The 2011 OJVG exploration program is continuing with excavator trenching on several new exploration targets and further drilling using three drills, including two core drills testing lateral and depth extension potential at the Mamasato discovery.

Technical supervision

Doug Turnbull, PGeo, is a qualified person for the purposes of National Instrument 43-101 and has verified the data disclosed in this news release. William Bond, PGeo, is also a qualified person for the purposes of National Instrument 43-101 and has supervised geologic field procedures. TSL Laboratories in Saskatoon carried out all assaying under industry-standard quality assurance/quality control procedures.

GOLOUMA-STYLE DEPOSITS/DISCOVERIES/TARGETS                

Drill       From     To  Interval     Gold
hole          (m)    (m)     (g/t)   grade

Mamasato  
DH-985         36    42         6     2.86
Incuding       40    41         1    10.85
DH-987         40    45         5     2.08
               52    57         5     2.64
Including      52    54         2     5.51
DH-994         46    53         7     2.09
Including      48    51         3     3.72
DH-997         42    49         7     2.23
DH-998         50    54         4    10.11
Including      52    53         1    36.69
DH-1001        63    68         5     3.58
Including      66    68         2     6.83
               72    75         3     2.39
Saboraya
RC-912 (ii)     0    18        18     2.84
Including      13    15         2    17.32
              155   165+       10+    1.55
Including     156   159         3     2.89
RC-862 (i)     80    85         5     8.91
Including      80    83         3    14.54
Including      81    82         1    34.84
RC-909 (i)     31    34         3     3.92
RC-911 (i)     69    92        23     3.44
Including      69    82        11     6.12
Including      69    71         2    26.21

(i)  Previously reported.                                                   
(ii) Drill hole RC-912 ends at 165 metres within a mineralized zone.       
     Mineralized intervals are based on one-metre samples utilizing 
     0.5 g/t gold cut-off levels with a maximum internal dilution of
     two metres. The attitude of mineralized intervals varies, and 
     reported mineralized intersections may not represent true widths.

BULK-TONNAGE (HEAP-LEACH) DEPOSITS/DISCOVERIES/TARGETS          

Drill      From       To  Interval    Gold
hole         (m)      (m)     (g/t)  grade

Sekoto
DH-996        8       20        12    0.55
             34       40         6    1.16
Including    36       38         2    2.89
DH-999       17       53        36    1.50
Including    22       45        23    2.15
Including    24       27         3    4.83
And          26       39         3    6.05
RC-899 (i)    5       28        23    0.65
Including    17       23         6    1.20
             56       74        18    1.67
Including    56       60         4    5.29
Including    56       57         1   15.79
             82       88         6    0.80
             17       29        12    0.84
Including    24       29         5    1.31
RC-901 (i)   60       64         4    1.29
RC-902 (i)   24       28         4    0.65
             68       73         5    1.67
RC-903 (i)   11       22        11    0.75
             30       34         4    0.50
RC-904 (i)   33       36         3    0.68
             49       55         6    0.81
Kinemba   
RC-914        2        8         6    0.66
             22       29         7    0.82
             73       85        12    0.70
Including    78       82         4    1.41
            107      126        19    0.66
Including   116      124         8    1.02
RC-916       17       25         8    1.07
Including    17       21         4    1.79
RC-917       12       25        13    0.76
Including    13       20         7    1.16
DH-988       45       49         4    0.63
            107      112         5    2.09
            125      133         8    0.63
            143      150         7    1.66
Including   148      149         1    8.50
RC-881 (i)   73       78         5    0.86
            110      121        11    0.81
Including   113      115         2    1.62
RC-882 (i)   29       37         8    0.64
             55       60         5    1.49
Including    58       59         1    5.56
RC-889 (i)   74       85        11    0.60
Including    80       84         4    1.29
            135      160        25    0.72
Including   135      138         3    2.16
Including   136      137         1    5.37
And         153      160         7    1.16
Including   156      159         3    2.02
RC-890 (i)  169      198        29    0.55
Including   169      180        11    0.69
And         192      195         3    1.15
DH-795 (i)   46       51         5    1.92
DH-803 (i)   35       41         6    1.07
            141      151        10    2.40
DH-810 (i)   16       21         5    1.73
             42       49         7    1.64

(i) Previously reported. Mineralized intervals are based on 
    one-metre samples utilizing 0.2 g/t gold cut-off levels
    with a maximum internal dilution of four metres. The attitude
    of mineralized intervals varies, and reported mineralized 
    intersections may not represent true widths.

August 17th, 2011
Categories: Uncategorized . Author: caliche