The (341.9 sq km) Boksay permit is located in the Liptako area of Niger and are contiguous with the companies current Deba and Tialkam permits along the known gold mineralized corridor.
The Boksay permit hosts the M\\\'Banga deposit (319,000 oz), several other gold anomalies and clusters of base metals detected by the Japanese International Cooperation Agency (JICA), Imperial Metals, Anmercosa and Orezone Resources.
A detailed presentation of all the drill holes, trenches, gold intersections and geochemical gold anomalies over and nearby the M\\\'Banga deposit along with a geological map are required to check if additional drilling is worthwhile and for its eventual planning.
An artisanal mining concession of 1 km² held by a private individual is within the Boksay perimeter.
The area to the north of the Niger River can be reached via a paved road, the southern area is accessible via the ferry boat at Farie or via the Niamey bridge and by driving on a laterite road along the north shore of the Niger River.
Canadian International Development Agency (CIDA) (1977-78)
An airborne magnetic/radiometric survey over the whole Liptako area has been funded by CIDA, the survey was flown by Survair Ltd and the data interpretation done by Tera Surveys.
United Nations Development Program (UNDP) (1990-91)
An airborne electromagnetic/magnetic Geotem survey over the Sirba and Tera belts has been funded by UNDP, ref.21.The ‘Compagnie Générale de Géophysique’ (CGG) flew the survey and has presented an interpretation report with ground follow up recommendations. Maps produced are for the electromagnetic anomalies, the residual magnetic field, the decay rate amplitude, the channel 8 amplitude and the data interpretation.
The permit perimeters have been partially covered by the Geotem survey that has been flown up to UTM coordinates 350E and 1515N.
Japanese International Cooperation Agency (JICA) (1989-93)
JICA has collected soil samples at a grid of 500m x 500m over the perimeter of the permits at the exception of small areas in the NE, NO corners of the permits.
The main clusters of gold anomalies that have been detected are M’Banga (MKS), Nord Gourmounde (GG3, CG6) and the ones along the Sirba (AA35, MM28, XX25, NT29 and NT24). The samples have been assayed for Au, As, Sb, Zn, Cu, Pb, F and Hg.
The MKS prospect has been evaluated by a geochemical survey at a grid of 200m x 200m, a gound electromagnetic survey, core drilling and trenching totaling respectively 2288m and 4900m.
Sumitomo / Imperial Metals (1995-97)
An airborne magnetic/radiometric survey has been flown over the M’Banga permit, (Boksay). Saprolite sampling at a depth of 5m to 10m with an auger drill has been done at a grid of 50m x 200m over cluster GG3 and anomalies T3-T4 and at a grid of 50m x 100m over cluster MKS that has been also covered by drilling and a ground magnetic/electromagnetic survey.
The main gold intersections from the twenty four drill holes over the MKS prospect are 1.64 g/t over 65m and 0.77 g/t over 73.5m. The geological resource distributed in seven distinct zones has been evaluated at 16.8 Mt grading 0.66 g/t, equivalent to 319,000 oz of gold.
Riverbed sediments were collected at a density of one sample per km² over the entire M’Banga perimeter; the anomalies detected have been follow-up by soil geochemistry at a grid of 200m x 200m. Geological mapping at 1:500 was done over artisan mining sites. The anomalies from riverbed sediments are over artisan mining sites where the mineralization is associated to veinlets of quartz in a granodiorite.
Greencastle Resources/Orezone Resources (2006-2008)
Orezone Resources Inc. signed an option agreement with Greencastle Resources Ltd in January 2006 and has completed over the next two years some geological mapping, pedogeochemical surveys and outcrop sampling (3991 samples), gradient IP surveys (104 km), an airborne magnetometry and radiometry survey (3260 km), air core drilling (2771m/147 holes) and RC drilling (6576m/109 holes).
The drilling programs returned some positive results including firstname.lastname@example.org g/t at M’Banga Centre, email@example.com g/t at CFA Moussa, firstname.lastname@example.org g/t at M’Banga SW and email@example.com g/t at Talle. However, the mineralized zones display limited width and weak continuity along strike.
Based on the previous work compilation, four prospective zones were targeted along an interpreted regional structural corridor which encompasses all of the most significant artisanal gold occurrences, namely Talle, CFA Moussa, M’Banga Centre and M’Banga SW. The other prospective areas such as Larba Birno and blocks 1 to 11 were identified in accordance with regional geological, geophysical and geochemical specific contexts.
Two large lithological units oriented NE-SW are present in the Boksay areas. The basic volcano-plutonic unit is locally amphibolitized, occasionally in a structure of pillow lavas and intruded by a microdiorite. The acid to intermediate metavolcano-sedimentary unit is composed of pyroclastic deposits such as rhyolitic and andesitic tuf covering about 70% of the permit area.
The belt of granodiorite in the SE corner of the permits is intruded locally by veins of diorite and monzogranite. The continental terminal is composed of clays and sandstone more or less argileous.
Larba Birno prospect
The Larba Birno prospect covers regional gold-in-soils anomalies located along the southwestern contact between a quartzitic diorite plug and intruded mafic volcanics. A total of 30 pits were dug on a 500m x 500m grid. All the pits reached the saprolite under about 2m of lateritic horizon. Eolian sand dunes reached locally a thickness of 4.3m. A total of 57 samples were collected by channel sampling with one sample taken over each regolith unit.
Lag samples (10-5mm fraction) were collected on the Talle prospect which is an EW oriented regional geochemical anomaly. A total 49 samples were collected on a 500m x 50m grid along NS oriented lines. Four RC holes totalling 300m were drilled over along a single fence line with only one gold intersection of firstname.lastname@example.org g/ in hole TLC0108.
Except for this mineralized zone, only massive fresh-looking mafic volcanics with weak to negligible strain were intersected, suggesting only minor gold potential.
CFA Moussa prospect
A total of 1631m/107 RAB holes and of 1599m/32 RC holes have been drilled at CFA Moussa to test the gold trend continuity along the interpreted regional NE corridor that coincides with extensive artisanal workings.
The best intersections were in hole CM0053 with email@example.com g/t, hole CM0058 with firstname.lastname@example.org g/t and hole CM0069 with email@example.com g/t. In spite of the extensive gold workings along the trend, the gold mineralization essentially hosted in intermediate volcanic appears to be confined to narrow zones with poor continuity. The volcanic is typically massive, weakly fractured, weakly altered with less than 15m of saprolite.
Lag sampling surveys were conducted on 200m x 100m grids on 11 targets (blocks) based on combined geophysical and geochemical regional anomalies. A total of 1110 samples at a 10-5mm fraction were collected. Except for some quartz veins, blocks 2 and 3 have not been sampled because those areas were found to be covered by continental terminal sandstone that is not prospective.
Lag sampling was complemented, wherever possible, by rock chips or channel sampling of the outcrops. A total of 288 rocks chips and 439 channel samples were thus collected on the permit.
M’Banga SW prospect:
On M’Banga SW, lag sampling on a 200m x 100m grid was used to test a structural target similar to M’Banga Centre and coincidental with a JICA regional soil geochemistry anomaly. A total 2096 samples at a 10-5mm fraction were collected along EW oriented lines and five RC holes totaling 375m were executed.
Only one of the five RC holes drilled on this prospect returned a significant intersection, hole MBC0078 with firstname.lastname@example.org g/t and email@example.com g/t. The mineralized zones seems to be characterized by a combination of low grade and narrow widths in moderately altered volcani-sedimentary rocks dominated by tuffs. Weathering is over 50m deep and strong limonite, kaolinite and rarely silica alteration is present.
M’Banga Centre prospect
At M’banga Centre, the 57 RC holes totaling 3752m were executed to test the continuity of the main gold trends along the interpreted regional NE corridor, including one NW subsidiary branch.
The results include firstname.lastname@example.org g/t in hole MBC0011, email@example.com g/t in hole MBC0040, firstname.lastname@example.org g/t in hole MBC0041, email@example.com g/t in hole MBC0091. Holes MBC0011, 40 and 41 has intersected another NE-trending mineralized zone with low grade and narrow width. Considering hole MBC0091 occurrence at 1.4 km distance along the same NE structure that runs across the Byri’s main artisanal gold working, the mineralization seems to pinch and swell along strike.
Based on surface exposure, gold workings and drill holes, the structure seems to be located along the contact between metasediments to the north and intermediate volcanic to the south. This contact is partially intruded by mafic intrusives which may have played a role in the mineralization process.
Next exploration targets
The drilling over the MKS prospect (M’Banga deposit) has delineated seven discontinuous gold stockwork vein systems containing a geological ore resource of 16.8 million tons grading 0.66 g/t, equivalent to 319,000 oz Au. Gold values reach 1.64 g/t over 65 meters in hole DDH96-18 and 0.77 g/t over 74 meters in hole DDH96-19. Lag sampling by Orezone over block B9 has detected several gold anomalies, some over 6 g/t.
A detailed presentation of all the drill holes, trenches, gold intersections and geochemical gold anomalies over and nearby the M’Banga deposit along with a geological map are required to check if additional drilling is worthwhile and for its eventual planning.
The two clusters of gold anomalies in Sorbon Haoussa, cluster A at the edge of a plateau and the cluster B over the JICA NT24 anomaly could be checked again despite any significant results from soil sampling over cluster A and trenching over cluster B.
Few samples along the eastern edge the plateau can be collected to check the presence of gold mineralization under it, the gold mineralization at the Libiri deposit is partly covered by a lateritic plateau. This sampling must be abandoned if the plateau is composed of Continental Terminal sandstone.
The geochemical data gathered by Anmercosa is needed for the planning of further work and should be available at the Ministry of Mines.
Orezone has identified three exploration targets in M’Banga SW, seventeen assays from the lags are over 100 ppb. The soil geochemistry in block KLD from Imperial Metals is within target A. Soil geochemistry and RAB drilling is proposed for the evaluation of these targets
The results of the lag survey need to be compiled at a larger scale for a better identification of the exploration targets, Orezone has likely a large scale map for this data.
The cluster of anomalies detected by Imperial Metals in block B10 is widespread but with relatively low gold values. Orezone has also identified anomalous values from lag sampling. RAB drilling is proposed for follow up.
Four lag samples with gold values of 335ppb, 698ppb, 687ppb and 794ppb have been identified by Orezone in block B5 where JICA has also detected a cluster of soil anomalies (MM28). A soil geochemical survey is proposed in this area.
Base metals target
A base metals target has been delineated by Anmercosa over a length of 1.3 km and a width of about 200 m. Its extension to the north remains open and also probably to the south under aeolian sands and alluvium from the Niger River. Copper mineralization has been detected at its northern tip, the metal zonation from a Zn horizon to a Zn-Cu horizon occurs on line 3700S. The zinc mineralization with values up to 1740 ppm in soils and 2950 ppm in drill holes is accompanied by higher contents in barium, manganese and iron.
The potential ore zone is surrounded by pyrite, carbonate and sericite alteration, Fe-Mn oxides are abundant, iron content varies from 4% to 10% over large intersections, Mn contents over 2000 ppm are frequent with peaks exceeding 1%.
The prospect is along a geological contact between a diorite and intermediate to felsic volcanics, the host rock is a rhyolitic tuff. The rocks sequence in drill holes includes meta-sediments with andalusite, pyroclastics, lavas, aplite, intermediate and basic intrusions. The regional rocks sequence goes from granitoids, basic volcanics with pillow lavas, intermediate volcanics, felsic volcanics, diorite and sandstone.
The sericite, andalusite and carbonate alteration zone around the prospect is a characteristic of stratiform Zn-rich ores, pyrite usually an abundant mineral in massive sulfide volcanic deposits, reaches concentrations of more than 20% over 25m, abundant barium minerals also support the occurrence of hydrothermal metalliferous ores.
The Ruttan mine in Manitoba, Canada (40Mt @ 1.25% Zn, 1.22% Cu, 12 g/t Ag, 0.48 g/t Au) is in a similar geological environment being in volcanoclastics along a contact with a diorite pluton. More details about the Namaro Cu-Zn prospect is available in a separate report, ref.18. Core and RC drilling is proposed for the evaluation of this base metals prospect.
More data gathering and compilation are needed for the elaboration of a detailed exploration program over the Boksay permit.
For the M’Banga deposit a detailed presentation of all the drill holes, trenches, gold intersections and geochemical gold anomalies over and nearby the M’Banga deposit along with a geological map are required.
The geochemical data gathered by Anmercosa is needed for the planning of further work over target A and B and should be available at the Ministry of Mines.
At M’Banga SW, the results of the lag survey need to be compiled at a larger scale for a better identification of the exploration targets.
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