SEMAFO Further Expands Mana's Wona SW Zone Results Include 4.17 g/t Au Over 32 Meters Kona Infill Drilling Confirms Mineralization Distribution
Kona Infill Drilling Confirms Mineralization Distribution
MONTREAL, QUEBEC -- (Marketwire) -- 05/12/11 -- SEMAFO (TSX: SMF) announced today that recent drilling over the Wona SW zone demonstrates multiple opportunities to further expand underground reserves from those reported in the Mana Underground Feasibility Study. Core drilling values including hole WDC256, which returned 4.17 g/t Au over 32 meters in an area formerly expected to be outside the mineralized zone. Furthermore, results from the in-progress infill drilling program over the Kona open pit area confirmed ore distribution.
The database and block model submitted for the underground Feasibility Study dated October 2010 were closed with diamond drill hole ('DDH') WDC223 and reverse circulation ('RC') hole MRC10-214. At year-end 2010, the updated database (up to WDC256 and MRC10-223) and block model over the Wona-Kona area resulted in the addition of resources to the underground, while new resources and reserves were added to the Kona open pit area. From completion of the underground block model database in October 2010 until early March 2011, 46 diamond drill holes representing 24,500 meters were completed over the Wona deposit and 124 RC drill holes representing 16,300 meters were carried out over the Kona zone. The following table illustrates the Wona zone and parallel structure drill results from the last months of 2010 and until early March 2011. The large volume of drilling explains a lengthier than usual assays turnover time.
Wona
Recent drilling results demonstrated significant potential for new reserves, particularly on the southern-most side of the Wona SW zone, as illustrated on the attached figure. These potential incremental reserves are derived from different sources; some are a result of upgrading former low-grade areas, others are upgrading resources from the inferred to the indicated category and therefore enabling the minimum level of confidence to create reserves and finally, some are an extension of the perimeters. An example of the latter is hole WDC256, where an embayment is created, which returned 4.17 g/t Au over 32 meters. This hole is located in an area where inferred resources had not been established prior to the drilling, as we believed it to be outside the mineralization trend. The extensions will require further lengthening of the proposed development. Additionally, due to their width, the project extensions will most likely be in-ore drifts consistent with Avocat Long Hole Mining. Higher than expected grades in certain areas also identified new upside within the current block model. These areas are crossed by planned drifts and therefore easily converted to reserves. Three rigs are active on infill drilling and on the extension of the Wona SW Zone.
DDH DRILLING WONA AREA
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DDH No. Zone Section From To AU(i) / Length(ii)
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WDC224 Wona SW 15250 178.0 189.0 2.74 g/t / 11.0 m
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WDC225 Wona SW 15050 143.6 152.8 2.07 g/t / 9.2 m
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WDC226 Wona SW 15000 162.0 167.0 3.17 g/t / 5.0 m
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WDC226 Parallel 15000 177.0 185.0 2.85 g/t / 8.0 m
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WDC227 Wona SW 16700 612.0 618.0 3.12 g/t / 6.0 m
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WDC227 Parallel 16700 323.5 324.5 15.00 g/t / 1.0 m
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72.60 g/t uncut
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WDC227 Parallel 16700 329.6 331.6 5.64 g/t / 2.0 m
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WDC228 Wona SW 14550 177.0 181.0 1.54 g/t / 4.0 m
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WDC229 Wona 17700 900.0 903.1 3.44 g/t / 3.1 m
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WDC229-W1 Wona 17700 920.0 924.0 2.75 g/t / 4.0 m
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WDC229-W1 Parallel 17700 1040.0 1041.0 12.30 g/t / 1.0 m
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WDC230 Wona SW 14450 187.0 189.0 1.90 g/t / 2.0 m
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WDC231 Wona SW 14750 178.0 181.0 0.67 g/t / 3.0 m
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WDC232 Wona SW 16100 212.6 215.0 1.64 g/t / 2.4 m
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WDC233 Wona SW 16100 174.0 177.0 0.76 g/t / 3.0 m
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WDC235 Wona SW 14600 172.0 181.0 0.78 g/t / 9.0 m
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WDC237 Wona SW 15500 233.0 261.0 3.49 g/t / 28.0 m
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Including 233.0 258.0 3.60 g/t / 25.0 m
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WDC238 Wona SW 15700 194.4 204.8 2.81 g/t / 10.4 m
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WDC240 Wona SW 15800 169.0 173.0 2.95 g/t / 4.0 m
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WDC241 Wona SW 15800 531.0 542.0 1.42 g/t / 11.0 m
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WDC243 Wona SW 15900 453.0 464.0 5.31 g/t / 11.0 m
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6.54 g/t uncut
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Including 460.0 463.0 11.62 g/t / 3.0 m
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16.13 g/t uncut
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WDC243 Parallel 15900 503.0 522.0 5.02 g/t / 19.0 m
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Including 504.0 512.0 7.16 g/t / 8.0 m
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WDC245 Wona SW 16000 475.0 483.0 3.39 g/t / 8.0 m
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WDC248 Wona SW 16100 481.0 506.0 2.41 g/t / 25.0 m
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WDC250 Wona SW 16500 823.8 878.0 1.64 g/t / 54.2 m
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Including 823.8 830.0 3.58 g/t / 6.2 m
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WDC250-W1 Wona SW 16500 651.0 657.0 2.52 g/t / 6.0 m
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WDC253 Wona SW 15700 393.5 416.8 2.62 g/t / 23.3 m
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WDC255 Wona SW 15400 285.8 293.0 2.43 g/t / 7.2 m
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WDC256 Wona SW 15300 281.0 313.0 4.17 g/t / 32.0 m
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5.25 g/t uncut
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Including 283.0 298.0 6.12 g/t / 15.0 m
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8.44 g/t uncut
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WDC257 Wona SW 16600 712.0 720.0 2.17 g/t / 8.0 m
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WDC257 Wona SW 16600 687.0 691.0 2.24 g/t / 4.0 m
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WDC262 Wona SW 16700 713.0 715.0 1.27 g/t / 2.0 m
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WDC267 Wona SW 16700 525.0 530.0 4.09 g/t / 5.0 m
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WDC270 Wona SW 16600 521.0 537.0 2.47 g/t / 16.0 m
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WDC275 Wona 16500 504.8 509.0 4.18 g/t / 4.2 m
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WDC276 Wona 16850 473.0 483.0 4.02 g/t / 10.0 m
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WDC277 Wona 17200 562.0 565.0 2.20 g/t / 3.0 m
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WDC279 Wona 16950 530.0 532.0 4.04 g/t / 2.0 m
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WDC280 Wona 17200 694.0 697.0 2.58 g/t / 3.0 m
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WDC281 Wona 16950 549.0 557.2 2.51 g/t / 8.2 m
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WDC282 Wona 16950 439.0 449.0 4.45 g/t / 10.0 m
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Including 442.0 449.0 5.42 g/t / 7.0 m
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WDC284 Wona SW 15700 341.0 392.0 2.27 g/t / 51.0 m
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Including 386.0 392.0 6.25 g/t / 6.0 m
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WDC285 Wona SW 15650 212.0 219.0 6.46 g/t / 7.0 m
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WDC286 Wona SW 15650 253.0 266.0 4.13 g/t / 13.0 m
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WDC287 Wona SW 15650 339.0 368.0 2.24 g/t / 29.0 m
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Including 357.0 360.0 5.10 g/t / 3.0 m
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(i)All values above 15 g/t Au are cut at 15 g/t Au.
(ii)All lengths are measured along the hole axis; additional information
is required to determine true widths.
The feasibility study of the underground project lowered the bottom of the underground mine by some 90 meters compared with the pre-feasibility planning, to an elevation of 4,770 meters. Accordingly, the very deep exploration drilling program is pushed deeper, with the remaining portion requiring higher grades to achieve economic viability. Infill drilling in the southwest, above 4,770 EL, will increase due to the ease of transformation to reserves, therefore requiring a more significant portion of the drilling program and thus slowing the investigation of the very deep area.
Kona
Recent infill drilling at Kona provides more precision to the reserves and surrounding resources, confirming year-end technical report estimations and ore distribution (ref. Annex 1: Kona Zone Reverse-Circulation Drill Results: http://media3.marketwire.com/docs/Kona.pdf). This program remains in progress.
The exploration programs were designed and managed locally by Dofinta Bonde and David Lalonde, Mana Mineral's Exploration Chief Geologists and Richard Roy P.Geo, Exploration Manager, and guided and supervised under the direction of Michel Crevier, P.Geo MScA, Geology Manager and SEMAFO's Qualified Person who has reviewed this press release for accuracy and compliance with National Instrument 43-101.
For core drilling, all individual samples represent approximately one-meter in length of core, which was sawed in half. Half of the core is kept on site for reference and its counterpart is sent for preparation and gold assaying at the ALS Chemex laboratories in Ouagadougou, Burkina Faso. For RC drilling, all individual samples represent approximately one meter in length of rock chips homogenized and riffle-split to an approximately 2-kilogram subsample, which is sent for preparation and gold assaying at the ALS Chemex laboratories in Ouagadougou, Burkina Faso. Each sample (core and RC) is fire-assayed for gold content on a 50-gram sub-sample at the same ALS Chemex laboratories. In addition to ALS Chemex's own QA/QC (Quality Assurance/Quality Control) program, an internal quality control and quality assurance program is in place throughout the sampling program, using blind duplicates, blanks and recognized industry standards.
About SEMAFO
SEMAFO is a Canadian-based mining company with gold production and exploration activities in West Africa. The Company currently operates three gold mines: the Mana Mine in Burkina Faso, the Samira Hill Mine in Niger and the Kiniero Mine in Guinea. SEMAFO is committed to evolve in a conscientious manner to become a major player in its geographical area of interest. SEMAFO's strategic focus is to maximize shareholder value by effectively managing its existing assets as well as pursuing organic and strategic growth opportunities.
Caution Concerning Forward-looking Statements
This press release may contain forward-looking statements. Forward-looking statements involve known and unknown risks, uncertainties and assumptions and accordingly, actual results and future events could differ materially from those expressed or implied in such statements. You are hence cautioned not to put undue reliance on forward-looking statements. Forward-looking statements include words or expressions such as 'further', 'expand', 'expected', 'in-progress', 'potential', 'believed', 'committed', 'evolve', 'become', 'pursuing' and other similar expressions. Factors that could cause future results or events to differ materially from current expectations expressed or implied by the forward-looking statements include the ability of the recent drilling over the Wona SW zone to expand underground reserves from those reported in the Mana Underground Feasibility Study, the ability of the recent and ongoing drilling to increase reserves on the southern-most side of the Wona SW zone, the ability to execute on our strategic focus, variation in the price of gold and currencies, mining industry risks, uncertainty as to calculation of mineral reserves and resources, delays, political and social stability in Africa (including our ability to maintain or renew licenses and permits) and other risks described in SEMAFO's documents filed with Canadian securities regulatory authorities. You can find further information with respect to these and other risks in SEMAFO's 2010 Annual MD&A, and other filings made with Canadian securities regulatory authorities and available at www.sedar.com. These documents are also available on our website at www.semafo.com. SEMAFO disclaims any obligation to update or revise these forward-looking statements, except as required by applicable law.
A map is available at the following address: http://media3.marketwire.com/docs/semafo0512.pdf
Contacts:
SEMAFO
Benoit La Salle, FCA
President & CEO
514-744-4408
Toll-Free:1-888-744-4408
blasalle@semafo.com
Sofia St Laurent
Communications
(514) 744-4408
Toll-Free:1-888-744-4408
sstlaurent@semafo.com