Mr. John McCluskey reports
ALAMOS GOLD RECEIVES POSITIVE METALLURGICAL TEST RESULTS FOR SAN CARLOS AND PROVIDES MULATOS EXPLORATION UPDATE
Alamos Gold Inc. has released positive results from metallurgical testing conducted on the high-grade ore at San Carlos. The results indicate that the high-grade ore is amenable to gravity separation, capable of providing an additional source of mill feed to the gravity plant that the company is currently constructing to process the high-grade ore at Escondida.
The company has also completed 32,400 metres of drilling in 155 holes to date in 2011 as part of its planned exploration drilling program at the Mulatos district.
San Carlos metallurgical test results
Two high-grade composite samples from the 2010 core drilling program at San Carlos were submitted for metallurgical testing. Testing was optimized to replicate the gravity plant that the company is currently constructing to process the high-grade ore at Escondida. Initial test results revealed that the high-grade ore at San Carlos is amenable to gravity separation and can be processed economically through the gravity plant. Approximately 57 per cent and 69 per cent of the contained gold in the two composites were recovered through gravity separation, and ultimate recovery rates were 70 per cent and 78 per cent, respectively, when the tailings were leached with cyanide. These levels of ultimate recovery are 15 per cent to 20 per cent higher than leaching the high-grade ore at San Carlos alone. The potential to improve these recovery rates exists and will be evaluated in the next phase of testing.
Using an anticipated cut-off grade of three grams of gold per tonne (g/t Au) for the gravity plant, in-pit mineral reserves at San Carlos total 398,000 tonnes grading 6.69 g/t Au. Outside the pit limit, measured and indicated mineral resources total 195,000 tonnes grading 4.99 g/t Au. The company believes the high-grade San Carlos reserves and resources could potentially double the mill feed for the gravity plant.
San Carlos exploration update
The company initiated a drill program in February, 2011, to test for new high-grade resources. The company has since drilled 7,400 metres in 21 holes. Assay results are presented in the associated table.
Notable assay results from recent drilling include:
-
11SC126 -- 4.57 metres at 19.54 g/t Au
and 16.77 metres at 1.28 g/t Au;
- 11SC127 -- 36.59 metres at 4.37 g/t Au;
- 11SC128 -- 9.14 metres at 30.45 g/t and Au
13.71 metres at 19.09 g/t Au;
- 11SC138 -- 13.72 metres at 5.80 g/t Au
and 3.05 metres at 22.56 g/t Au;
- 11SC139 -- 3.04 metres at 3.37 g/t Au;
- 11SC144 -- 12.20 metres at 1.09 g/t Au.
Drill holes 126, 127 and 128 are infill and step-out holes drilled on the northeast edge of the resource area. The results from these holes confirm the continuity of the high-grade mineralization toward the northeast. The remaining holes reflect intercepts from additional en echelon structural high-grade zones discovered to the northeast of the main San Carlos resource. The company identified at least two additional subparallel structures, located up to 600 metres from the resource area, with surface mapping indicating the potential for additional zones to the northeast. The new zones are located at the same elevation as the existing mineralization but under significant overburden and are potentially amenable to underground mining. Additional wide-spaced drilling is planned to define the extent of the new mineralized zones.
The recent San Carlos drill program has identified high-grade gold mineralization in the stratigraphic units above the main district host rock stratigraphy, which was previously thought to be barren of gold mineralization. This mineralization represents a late-stage high-grade event, overprinting the main Mulatos low-grade gold mineralization, similar to the relationship at the Escondida deposit. This concept in conjunction with recent mapping has resulted in the identification of several new near-mine high-grade targets for future drill testing.
El Carricito exploration update
Step-out drilling at El Carricito continues in 2011 testing geochemical and geologic targets and expanding on significant intercepts from previous drilling. The company drilled 12,400 metres in 56 drill holes to date, and relevant assay results are presented in the associated tables. Drilling has focused on delineating and expanding mineralization identified at Cerro Carricito and Cerro Colorado, two areas of thick, laterally extensive, low-grade gold mineralization on the western side of the property. The company has drill tested only a relatively small area of the target considering the large size of the El Carricito.
Most of the holes drilled at El Carricito have intersected wide intercepts of oxidized silicic alteration containing anomalous gold concentrations. The host rocks are porphyritic, rhyodacite, dacite and fragmental volcanic rocks similar to those hosting the Mulatos deposit. Substantial multiphase hydrothermal breccias are also present, as well as mafic dikes similar to those associated with the San Carlos deposit.
Notable recent assay results at a 0.10 g/t Au cut-off from the continuing drill program include:
- 11CR029 -- 9.15 metres at 0.66 g/t Au;
- 11CR045 -- 7.62 metres at 0.82 g/t Au;
- 11CR046 -- 13.77 metres at 0.47 g/t Au;
- 11CR047 -- 71.65 metres at 0.52 g/t Au;
- 11CR049 -- 6.10 metres at 1.02 g/t Au
and 10.67 metres at 0.55 g/t Au;
- 11CR065 -- 12.20 metres at 0.44 g/t Au;
- 11CR068 -- 15.25 metres at 0.52 g/t Au;
- 11CR069 -- 12.20 metres at 0.97 g/t Au;
- 11CR071 -- 12.19 metres at 0.89 g/t Au;
- 11CR072 -- 21.34 metres at 0.49 g/t Au;
- 11CR073 -- 48.78 metres at 0.31 g/t Au.
Following interpretation of results to date and a field review by an internationally recognized epithermal specialist, significant effort is being put into a detailed mapping of the Cerro Carricito and Cerro Colorado areas on the western side of the project area, where alteration zonation, gold distribution and multielement geochemical anomalies indicate proximity to the structural feeder and centre of the system. The geologic work is leading toward a predictive model that explains the distribution of gold intercepts at El Carricito. A new area of gold-anomalous vuggy silica has been recently identified based on this model between the Cerro Colorado and Cerro Carricito areas, and new drill roads and sites are being constructed.
Two reverse circulation drill rigs are operating at El Carricito with a core drill rig to be relocated to the area to provide additional geological information and compare the grade of core intercepts with those of reverse circulation drilling.
Quality assurance/quality control (QA/QC) programs
Mulatos exploration programs are conducted under the supervision of Ken Balleweg, BSc, geological engineering, MSc, geology, registered professional geologist, Alamos's Mexico exploration manager. Mr. Balleweg is a qualified person as defined by National Instrument 43-101 of the Canadian securities administrators. Strict sampling and QA/QC protocols are followed, including the insertion of standards, blanks and duplicates on a regular basis. Sample intervals are usually 0.5 metre to 1.5 metres. Mulatos samples are sent to ALS Chemex Inc. in Hermosillo, Mexico, for sample preparation and then to Vancouver, B.C., Canada, for analysis. Analytical method is fire assay with atomic adsorption finish and gravimetric finish for individual samples with a gold concentration greater than five g/t Au. Composites presented in the assay results tables include intervals at greater than 0.35 g/t over a three-metre minimum width with no assays cut, unless indicated.
SAN CARLOS -- SELECT COMPOSITE INTERVALS(1)
(Intervals at greater than 0.35 g/t Au over
three-metre minimum width, no assay cut)
Drill hole Total Interval Assay (g/t
No. depth (m) From (m) To (m) (m) Au)
152.44 157.01 4.57 19.54
170.73 187.50 16.77 1.28
11SC126 251.52 198.17 208.84 10.67 1.35
211.89 219.51 7.62 1.28
236.28 239.33 3.05 3.37
135.67 172.26 36.59 4.37
11SC127 230.18 175.30 182.93 7.63 0.62
201.22 207.32 6.10 1.00
217.99 225.61 7.62 0.77
117.38 126.52 9.14 30.45
11SC128 233.23 Inc.117.38 121.95 4.57 58.33
137.20 150.91 13.71 19.09
Inc.137.20 143.29 6.09 41.40
11SC129 263.72 195.12 201.22 6.10 0.68
205.79 213.41 7.62 0.66
11SC131 303.35 No intervals
11SC132 330.79 219.51 222.56 3.05 0.66
227.13 230.18 3.05 0.77
11SC133 301.83 No intervals
11SC135 382.62 300.30 310.98 10.68 0.83
329.27 338.41 9.14 2.70
327.74 330.79 3.05 1.90
11SC136 452.74 333.84 336.89 3.05 1.45
346.04 349.09 3.05 0.67
378.05 382.62 4.57 0.36
260.67 271.34 10.67 0.47
11SC137 458.84 282.01 292.68 10.67 0.77
295.73 298.78 3.05 3.80
266.77 280.49 13.72 5.80
283.54 292.68 9.14 0.37
11SC138 431.40 306.40 309.45 3.05 22.56
358.23 379.57 21.34 0.98
382.62 387.20 4.58 1.94
402.44 407.01 4.57 0.64
172.26 175.30 3.04 3.37
179.88 184.45 4.57 0.47
11SC139 275.91 196.65 199.70 3.05 2.33
204.27 207.32 3.05 0.37
222.56 230.18 7.62 1.14
11SC140 352.13 169.21 172.26 3.05 0.67
182.93 190.55 7.62 1.91
11SC141 379.57 271.34 277.44 6.10 1.11
272.87 277.44 4.57 0.87
11SC142 394.82 288.11 295.73 7.62 1.22
307.93 314.02 6.09 0.54
11SC143 474.09 No intervals
301.83 309.45 7.62 0.40
11SC144 458.84 317.07 329.27 12.20 1.09
332.32 335.37 3.05 2.60
Notes
(1) Due to the exploratory nature of this program and the variable
orientations of the mineralized zones, the intersections presented
herein may not necessarily represent the true width of mineralization.
EL CARRICITO -- SELECT COMPOSITE INTERVALS(1)
(Intervals at greater than 0.35 g/t Au over
a three-metre minimum width, no assay cut)
Drill hole Total From To Interval Assay
No. depth (m) (m) (m) (m) (g/t Au)
11CR025 243.90 No intervals
11CR026 198.17 No intervals
11CR027 260.67 No intervals
11CR028 198.17 No intervals
11CR029 243.90 178.35 182.93 4.58 1.18
11CR030 182.93 No intervals
11CR031 260.67 No intervals
11CR032 259.15 172.26 176.83 4.57 0.82
11CR033 324.70 214.94 217.99 3.05 0.82
224.09 227.13 3.04 0.75
11CR034 228.66 No intervals
11CR035 243.90 208.84 211.89 3.05 1.05
11CR036 355.18 No intervals
11CR037 283.54 3.05 6.10 3.05 0.55
263.72 269.82 6.10 0.39
11CR038 274.39 173.78 176.83 3.05 0.98
11CR039 257.62 No intervals
11CR040 228.66 No intervals
11CR041 213.41 No intervals
11CR042 318.60 No intervals
11CR043 243.90 94.51 97.56 3.05 0.84
11CR044 260.67 134.15 141.77 7.62 0.50
11CR045 243.90 94.51 102.13 7.62 0.81
192.07 196.65 4.58 0.55
11CR046 291.16 153.96 158.54 4.58 0.84
11CR047 243.90 102.13 114.33 12.20 0.88
126.52 143.29 16.77 0.98
11CR048 260.67 No intervals
11CR049 198.17 100.61 105.18 4.57 1.33
121.95 125.00 3.05 1.43
11CR050 243.90 No intervals
11CR051 182.93 No intervals
11CR052 243.90 No intervals
11CR053 213.41 No intervals
11CR054 243.90 82.32 88.41 6.09 0.50
138.72 143.29 4.57 0.42
25.91 32.01 6.10 0.47
11CR055 213.41 74.70 83.84 9.14 0.80
88.41 99.09 10.68 0.47
11CR056 182.93 No intervals
11CR057 243.90 92.99 99.09 6.10 0.65
11CR058 182.93 No intervals
11CR059 199.70 27.44 30.49 3.05 0.75
83.84 94.51 10.67 0.63
11CR060 213.41 No intervals
11CR061 48.78 No intervals
11CR062 57.93 No intervals
11CR063 274.39 No intervals
11CR064 92.99 42.68 45.73 3.05 0.68
11CR065 181.40 51.83 57.93 6.10 0.69
11CR066 274.39 No intervals
11CR067 213.41 No intervals
11CR068 248.48 10.67 18.29 7.62 1.02
11CR069 214.94 7.62 19.82 12.20 0.97
11CR070 243.90 No intervals
11CR071 182.93 10.67 18.29 7.62 1.20
11CR072 111.28 15.24 28.96 13.72 0.65
50.30 59.45 9.15 0.41
62.50 67.07 4.57 0.38
11CR073 198.17 74.70 77.74 3.04 0.76
86.89 89.94 3.05 0.45
129.57 132.62 3.05 0.90
Notes
(1) Due to the exploratory nature of the program and the variable
orientations of the mineralized zones, the intersections presented
herein may not necessarily represent the true width of mineralization.
EL CARRICITO -- SELECT COMPOSITE INTERVALS(1)
(Intervals at greater than 0.10 g/t Au over a
three-metre minimum width, no assay cut)
Drill hole Total From To Interval Assay
No. depth(m) (m) (m) (m) (g/t Au)
140.24 147.87 7.63 0.12
10CR025 243.90 166.16 184.45 18.29 0.16
199.70 225.61 25.92 0.17
11CR026 198.17 4.57 12.20 7.63 0.11
11CR027 260.67 193.60 228.66 35.06 0.17
11CR028 198.17 103.66 125.00 21.34 0.11
100.61 112.80 12.19 0.11
11CR029 243.90 163.11 170.13 7.62 0.13
176.83 185.98 9.15 0.66
11CR030 182.93 9.15 27.44 18.29 0.10
11CR031 260.67 211.89 230.18 18.29 0.10
44.21 57.93 13.72 0.18
96.04 103.66 7.62 0.20
129.57 134.15 4.58 0.15
11CR032 259.15 144.82 164.63 19.81 0.13
170.73 185.98 15.25 0.40
192.07 201.22 9.15 0.13
205.79 213.41 7.62 0.12
181.40 184.45 3.05 0.15
193.60 198.17 4.57 0.14
11CR033 324.70 214.94 228.16 13.22 0.42
240.85 254.57 13.72 0.21
298.78 324.70 25.92 0.16
11CR034 228.66 38.11 42.68 4.57 0.15
182.93 185.98 3.05 0.15
214.94 222.56 7.62 0.17
65.55 79.27 13.72 0.15
11CR035 243.90 86.69 92.99 6.30 0.20
102.13 112.80 10.67 0.15
202.74 214.94 12.20 0.36
11CR036 355.18 No intervals
3.05 6.10 3.05 0.55
11CR037 283.54 198.17 201.22 3.05 0.23
251.52 283.54 32.02 0.18
11CR038 274.39 169.21 185.98 16.77 0.36
190.55 193.60 3.05 0.32
11CR039 257.62 No intervals
137.22 152.44 15.24 0.12
11CR040 228.66 161.59 166.16 4.57 0.41
190.55 193.60 3.05 0.11
11CR041 213.41 132.62 141.77 9.15 0.11
157.01 160.06 3.05 0.20
11CR042 318.60 No intervals
71.65 74.70 3.05 0.19
11CR043 243.90 94.51 99.09 4.58 0.59
152.44 158.54 6.10 0.19
225.61 236.28 10.67 0.11
11CR044 260.67 126.52 149.39 22.87 0.25
94.51 102.13 7.62 0.82
11CR045 243.90 129.57 158.54 28.97 0.20
169.21 198.17 28.96 0.20
214.94 224.09 9.15 0.13
138.72 143.29 4.57 0.11
11CR046 291.16 153.96 169.21 13.72 0.47
175.30 181.40 4.57 0.17
53.35 64.02 10.67 0.12
68.60 73.17 4.57 0.14
11CR047 243.90 77.74 149.39 71.65 0.52
155.49 166.16 10.67 0.13
170.73 181.40 10.67 0.16
11CR048 260.67 No intervals
22.87 35.06 12.19 0.19
64.02 70.12 6.10 0.18
11CR049 198.17 76.22 86.89 10.67 0.17
100.61 106.71 6.10 1.02
115.85 126.52 10.67 0.55
134.15 160.06 25.85 0.16
11CR050 243.90 134.15 147.87 13.72 0.27
150.91 161.59 10.68 0.17
11CR051 182.93 No intervals
56.40 65.55 9.15 0.13
70.12 85.37 15.25 0.17
11CR052 243.90 109.76 114.33 4.57 0.30
164.63 204.27 39.64 0.19
239.33 243.90 4.57 0.13
35.06 39.63 4.57 0.16
11CR053 213.41 118.90 123.48 4.58 0.14
131.10 135.67 4.58 0.14
144.82 150.91 6.09 0.11
11CR054 243.90 51.83 105.18 53.35 0.22
131.10 150.91 19.81 0.19
11CR055 213.41 19.82 64.02 44.20 0.20
74.70 120.43 45.73 0.36
11CR056 182.93 No intervals
24.39 50.30 25.91 0.19
11CR057 243.90 64.02 71.65 7.63 0.22
89.94 106.71 16.77 0.35
112.80 123.48 10.68 0.20
11CR058 182.93 No intervals
11CR059 199.70 24.39 48.78 24.39 0.25
73.17 106.71 33.54 0.38
11CR060 213.41 No intervals
11CR061 48.78 42.68 47.26 4.58 0.27
11CR062 57.93 No intervals
11CR063 274.39 No intervals
11CR064 92.99 39.63 70.12 30.49 0.17
82.32 92.99 10.67 0.15
11CR065 181.40 50.30 62.50 12.20 0.44
76.22 79.67 3.05 0.15
11CR066 274.39 No intervals
11CR067 213.41 No intervals
4.57 19.82 15.25 0.56
11CR068 248.48 41.16 44.21 3.05 0.11
80.79 85.37 4.58 0.11
11CR069 214.94 7.62 19.82 12.20 0.97
85.37 89.94 4.57 0.13
11CR070 243.90 No intervals
11CR071 182.93 6.10 18.29 12.19 0.84
13.72 35.06 21.34 0.49
11CR072 111.28 50.30 77.74 27.44 0.15
83.34 89.94 6.10 0.17
11CR073 198.17 48.78 97.56 48.78 0.31
118.90 134.15 15.25 0.32
Notes
(1) Due to the exploratory nature of this program and the variable
orientations of the mineralized zones, the intersections presented
herein may not necessarily represent the true width of mineralization.
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