Lake Shore Gold Corp.

Lake Shore Gold Corp.

February 22, 2012 12:24 ET

Lake Shore Gold Announces Large Increase in Resources at Gold River Trend, Total Ounces Nearly Triple, Grade Doubles

TORONTO, ONTARIO--(Marketwire - Feb. 22, 2012) - Lake Shore Gold Corp. (TSX:LSG)(NYSE Amex:LSG) ("Lake Shore Gold" or the "Company")

  • New resource totals 117,400 ounces gold ("Au") grading 5.29 grams per tonne ("gpt") in Indicated category and 1,027,800 ounces Au grading 6.06 gpt in Inferred category

  • New high-grade core at East Deposit between 400 and 800 metre levels, contains 310,900 ounces at average grade of 9.81 gpt, area remains open at depth and along strike

  • Company's total resource base on west side of Timmins increased to 1,239,900 ounces grading 5.92 gpt in Indicated category and 1,819,300 ounces grading 5.93 gpt in Inferred category

  • Potential for additional resources from extensions and new discoveries considered excellent, definition and expansion drilling in progress.

Lake Shore Gold Corp. today announced an updated National Instrument ("NI") 43-101 resource estimate for the Company's Gold River Trend deposits on the west side of Timmins. Resources at the Gold River Trend are contained within two deposits, the East Deposit and West Deposit, both of which are located approximately 4.0 kilometres south of the producing Timmins West Mine shaft. The deposits are contained within a 3.0 km strike length and run along the Gold River Trend, a major alteration and deformation zone lying north of the Destor Porcupine Fault Zone (DPFZ). In combination, the updated resources for both deposits include 117,400 ounces Au (690,000 tonnes grading 5.29 gpt) in the Indicated category and 1,027,800 ounces Au (5,273,000 tonnes at an average grade of 6.06 gpt) in the Inferred category.

With this new resource update for Gold River Trend, the Company's total resource base on the west side of Timmins stands at 1,240,000 ounces Au (6,515,000 tonnes grading 5.92 gpt) in the Indicated category and 1,819,300 ounces Au (9,545,000 tonnes grading 5.93 gpt) in the Inferred category. A summary of resources at Gold River Trend is shown in Table 1 below. Table 2 summarizes the total resource base at the Company's Timmins West Complex.

Table 1. Gold River Trend Deposits



Capped Grade
(gpt (i) Au)

Ounces Au
East Indicated 597,000 5.42 104,100
Inferred 4,317,000 6.39 887,400
West Indicated 93,000 4.44 13,300
Inferred 955,000 4.57 140,500
Total Indicated
(i) Grams per tonne

Note: The resource estimate for the Gold River deposits was estimated using the Inverse Distance to the power 2 (ID2) with all gold assays capped to 50 or 25 gram-metres depending on the zone. An assumed long-term gold price of US$1,200 per ounce was used. The base case estimate assumes a cut off grade of 2.0 gpt. Sums may not add due to rounding.

Table 2. Timmins West Complex



Capped Grade
(gpt (i) Au)

Ounces Au
Gold River



Inferred 5,273,000 6.06 1,027,800
Timmins West Mine Indicated
Total Indicated
(i) Grams per tonne

Note: The resource estimates for the Gold River Trend and Timmins West Mine (Timmins and Thunder Creek deposits) were estimated using an assumed long-term gold price of US$1,200 per ounce. The base case estimates for the Timmins West Mine deposits use a cut off grade of 1.5 gpt and the base case for the Gold River deposits use a 2.0 gpt cut off grade. The resource estimate for Timmins deposit was estimated using the Inverse Distance to the power 3 (ID3) interpolation method with all gold assays capped to 70 gram-metres for the Ultramafic Zone and 40 gram-metres for the Vein Zones. The resource estimate for the Thunder Creek deposit was estimated using the Inverse Distance to the power 2 (ID2) with all gold assays capped to 75 gram-metres. The Gold River resource was estimated using the Inverse Distance to the power 2 (Id2) with all gold assays capped to 50 or 25 gram-metres depending on the zone. Sums may not add due to rounding.

Tony Makuch, President and CEO of Lake Shore Gold, commented: "We are extremely pleased to be announcing this updated resource estimate for Gold River Trend, which nearly triples the total ounces and doubles the average grade from the previous estimate. With a 3.0 km strike length of the mineralization, the relative shallow depth of the resources and the zones remaining open in all directions, significant opportunity exists to continue to build the resource base along the Gold River Trend. With today's announcement, we have now added to our portfolio a fifth deposit containing more than a million ounces of gold and the third within our land position on the west side of Timmins."

The Gold River Trend is located approximately 2.0 kms north of the DPFZ and surrounds an east-west trending, steeply northward dipping contact between volcanic and sedimentary rocks. Mineralization is contained in multiple zones located immediately to the south of the contact and closely associated with quartz-feldspar porphyry dikes, dark grey quartz veining, increased pyrite/arsenopyrite and local visible gold. The presence of a newly recognized mafic volcanic unit which lies on the north side of the Golden River shear zone suggests that the mineralization is coincident with an early thrust fault that introduces possible Tisdale aged volcanic rocks into the Porcupine Basin. This structural setting is similar to the setting in the main Porcupine Camp, which includes the Hoyle Pond New Mine Trend, as well as the Dome Trend, the latter hosting such historic producers as Dome, Paymaster, Preston, Buffalo Ankerite, Aunor and Delnite.

The previous resource at the Gold River Trend was reported in 2002 and included approximately 400,000 ounces grading 3.0 gpt, all in the inferred category. Approximately two-thirds of the previously reported resource is located in the East Deposit with the remainder in the West Deposit.

The updated resources at Gold River are contained within a 3.0 km strike length of the Gold River Trend with mineralization dipping at approximately 80 degrees to the north. The bulk of the new resources are contained within the East Deposit, which covers a 1.5 km strike length, while the remaining ounces are located in the West Deposit, which is approximately 500 metres to the west. Over 70 percent of total resources are located within 400 metres of surface. Ounces located below 400 metres are concentrated in a high-grade core in the East Deposit located between 400 and 800 metres below surface. The high-grade core includes 986,000 tonnes at an average grade of 9.81 gpt for 310,900 ounces and remains open to depth below 800 metres.

The resource includes 140 holes of new surface drilling, completed by Lake Shore Gold since February 2010 for 55,816 metres. Most of the new holes were focused on the East Deposit area and within 600 metres from surface with limited near surface drilling also being carried out at the West Deposit. Drilling along strike and to depth between the two deposits is very limited and both deposits are considered open.

The updated Gold River resource estimate was calculated using updated geological models from the previous estimate as well as an inverse distance squared interpolation method with all high assay values being capped to 50 gpt or 25 gram-metres depending on the zone. Typical drill spacing for Indicated resources is less than 25 metres and for Inferred resources is less than 50 metres. A total of 15 mineralized zones were identified with over 95% of zones containing over 10 drill intercepts with more than half containing more than 20 intercepts. The average width of mineralization in the resource is 3.5 metres, with the high-grade core below 400 metres at the East Deposit averaging 4.5 to 5.0 metres in width.

As part of the resource evaluation a sensitivity analysis was completed from the base case cut-off grade of 2.0 gpt using various cut off grades between 1.00 and 5.00 gpt. The analysis indicates the robust nature of the overall resource and potential to optimize the mining grade and maximize margins and profitability at increased cut-off grades with little loss of ounces.

Table 3. Sensitivity Analysis for Gold River Deposits
Cut-Off Grade (gpt) Tonnes Grade (gpt) Ounces Au
1.0 6,987,000 5.32 1,195,500
1.5 6,657,000 5.58 1,178,800
2.0 (Base Case) 5,962,900 5.97 1,145,200
3.0 4,715,000 6.89 1,044,400
5.0 2,458,000 9.60 758,700
1. Grades are capped to 50 or 25 gram-metres depending on the zone.
2. Sums may not add due to rounding.
3. Tonnages and grades are reported on an unclassified basis for information purposes only.

The base case resource estimate and sensitivity calculations were completed using a number of operating and economic parameters and geological interpretations of the mineralization. Key assumptions include using a minimum mining width of two metres, a gold price of US$1,200 per ounce, US$/C$ exchange rate of 0.93, average production costs of $90.00 per tonne and average processing recoveries of 85%. Further work is required in order to verify the assumptions used and actual results may vary.

Drilling is continuing at the East Deposit with two surface drills doing a combination of infill and expansion drilling. Current plans are to complete a total of 15,000-20,000 metres at the project before the end of 2012.

Qualified Persons

The Company intends to file a Technical Report that is in compliance with the requirements of NI 43-101 within 45 days of the issue of this news release.

The Qualified Person ("QP") for the updated resource estimate is Bob Kusins, P. Geo, Chief Resource Geologist at Lake Shore Gold Corp. As QP, Mr. Kusins has prepared or supervised the preparation of the scientific or technical information and have verified the data disclosed in this press release. The resource estimate has also been reviewed by Michel Dagbert, P.Eng of SGS Geostat.

About Lake Shore Gold

Lake Shore Gold is a rapidly growing mining company with a vision to become a mid-tier gold producer through the successful exploration, development and operation of its properties in and around the century-old Timmins Gold Camp. The Company is in commercial production at the Timmins West Mine, comprising the Timmins and Thunder Creek deposits, and is progressing with an underground advanced exploration program at its Bell Creek Mine. Mine production is delivered to the Company's wholly owned mill (located on the Bell Creek Property east of Timmins) which is operational at a capacity of 2,000 tonnes per day and is currently being expanded to a 3,000 tonne per day with completion targeted for late 2012. The Company continues to invest aggressively in exploration at its multiple properties in and around the Timmins Camp. The Company's common shares trade on the TSX and NYSE Amex under the symbol LSG.


Certain statements in this press release relating to the Company's expected production levels, production growth, exploration activities, potential for increasing resources, project expenditures and business plans are "forward-looking statements" or "forward-looking information" within the meaning of certain securities laws, including under the provisions of Canadian provincial securities laws and under the United States Private Securities Litigation Reform Act of 1995 and are referred to herein as "forward-looking statements." The Company does not intend, and does not assume any obligation, to update these forward-looking statements. These forward-looking statements represent management's best judgment based on current facts and assumptions that management considers reasonable, including that operating and capital plans will not be disrupted by issues such as mechanical failure, unavailability of parts, labour disturbances, interruption in transportation or utilities, or adverse weather conditions, that there are no material unanticipated variations in budgeted costs, that contractors will complete projects according to schedule, and that actual mineralization on properties will be consistent with models and will not be less than identified mineral reserves. The Company makes no representation that reasonable business people in possession of the same information would reach the same conclusions. Forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. In particular, delays in development or mining and fluctuations in the price of gold or in currency markets could prevent the Company from achieving its targets. Readers should not place undue reliance on forward-looking statements. More information about risks and uncertainties affecting the Company and its business is available in the Company's most recent Annual Information Form and other regulatory filings with the Canadian Securities Administrators, which are posted on sedar at, or the Company's most recent Annual Report on Form 40-F and other regulatory filings with the Securities and Exchange Commission.

There is no guarantee that resources reported in this news release can be mined economically, and further work is required to identify reserves.

Table 4. Gold River Trend Resources By Level February 2012
Resource Classification Level Zone Group Tonnes Capped Grade
g/t Au
Contained Gold
Indicated Resources Surface to 400m Level East 597,000 5.42 104,100
West 93,000 4.44 13,300
All 690,000 5.29 117,400
400 to 800 Level East -------- -------- --------
West -------- -------- --------
All -------- -------- --------
Total Indicated East 597,000 5.42 104,100
West 93,000 4.44 13,300
All 690,000 5.29 117,400
Inferred Resources Surface to 400m Level East 3,331,000 5.38 576,400
West 950,000 4.58 139,700
All 4,281,000 5.20 716,100
400 to 800m Level East 986,000 9.81 310,900
West 6,000 3.87 700
All 992,000 9.78 311,700
Total Inferred East 4,317,000 6.39 887,300
West 955,000 4.57 140,500
All 5,273,000 6.06 1,027,800
Resource blocks reported at a 2.0 gpt cut-off grade.
Sums may not add due to rounding.

To view Figure 1-Location Map, please visit the following link:

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