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Alamos

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The Alamos silver project contains a wide, high-grade epithermal vein system which has historically produced approximately 200 Moz of silver. The project has never been systematically explored, and so far, historical and Minaurum mapping and sampling work has identified 8 additional vein target zones.

Alamos hosts excellent infrastructure with the central area (Quintera-Promontorio vein system) permitted from exploration through to production. The project is 8km west of the city of Alamos, 45km northwest of Pan American's Alamo Dorado silver mine, and 15km south of Cobre Del Mayo's Piedras Verdes copper mine. The project comprises a 16,445 hectare concession.

Please click the images below to learn more about the Alamos Silver Project and our exploration programs from our Co-founder & Director, Dr. Peter Megaw himself and Steve Maynard, VP Exploration.

The Proof of Concept at the Alamos Silver Project by Dr. Peter Megaw

       


Megaw explains some of the drill core at Alamos.       Steve Maynard, VP Exploration discusses our exploration plans.

      

 

 

The Alamos Mining District

Zambona Mine & Minas Nuevas in 1929


Major Nearby Mines and Projects in the Alamos Mining District

Pan American's Alamo Dorado mine – 45km SE of Alamos project

Cobre Del Mayo's Piedras Verdes copper mine - 15km N of Alamos project

 

Historical Producing District

The district has produced an estimated 200 million ounces of silver since the 1600s, mostly from the La Quintera and Promontorio mines, with small amount from Zambona-Purisima (Minas Nuevas) mines. The project has seen little modern exploration. The 3.5-km long La Quintera-Promontorio vein zone is part of a vein system that is more than 7 km in strike length and is more than 1 km wide. According to historical reports, vein widths in the La Quintera and Promontorio mines averaged 4 m and locally ranged up to 20 m. Historical records of selective mining indicate grades of more than 2,000 g/t Ag were recovered using a cut-off grade of 1,000 g/t Ag.

Exploration Model and New Vein Targets

"Piano Key Model"

Dr. Megaw’s model explains why production only occurred at the core part of the Alamos project. In the core, up-thrown blocks had high grade portions of veins exposed on surface leading to their development. Down-thrown blocks to the west and east are exposed on surface at a higher level (or not at all in the case of blind veins). Exposed at a higher level, these veins are spottier or lower grade and as such were not put into production.

Over 780 samples have been analyzed identifying several selected targets ranging from 308 – 3,230 g/t silver, resulting in tracing 8 additional vein target zones.

Exploration has expanded the Alamos district footprint to 10km x 3km.

10 Target Zones Identified and Counting

  1. Europa-Guadalupe-Europa Sur Vein - 2.5km
  2. Promontorio - 1km
  3. Nueva Europa - 1.5km
  4. "Gap" - 0.4km
  5. Minas Nuevas - 0.7km
  6. Blind Veins - Multiple
  7. Amalia - 0.5km
  8. La Quintera Parallel - 0.8km
  9. Pulpito & Cotera - 0.8km
  10. Ana - 2km

            Geological Map of Target Vein Zones at the Alamos Silver Project

 

 
            Alamos Project Sampling Results of >100 g/t Ag & >300 g/t Ag

 

TARGET ZONES

#1 - Europa-Guadalupe Target
 
Located west of the Promontorio-Quintera vein system and the source of almost all of the historical production from the Alamos District.  The piano key model is proven by Hole 7 that discovered veins at depth with high grades and wide widths in the down-thrown blocks.   
 

Hole

From (m)

To (m)

Interval (m)

Ag (g/t)

Au (ppb)

Cu (%)

Pb (%)

Zn (%)

Comment

AL17-007

521.55

524.6

3.05

114

4

0.19

0.07

0.22

Europa-Guadalupe-Palomas vein zone

534.65

542.9

8.25

1,760

58

1.6

1.48

2.6

including

534.65

536.85

2.2

5,098

42

2.76

0.47

1.18

 

Cross section of holes AL17-007 and AL17-008, showing locations of mineralized intervals and interpreted geology. Europa-Guadalupe was intersected at a depth of 325m below surface

 

Map of the central part of the Alamos project, showing known vein zones and surface projections of drilling to date. Tics on drill-hole traces are at 100-m intervals.

 * Ag Equivalent is reported for comparison only, with no assumptions regarding metal recovery or smelter payments. Prices used are: Au: $1,321.00/troy ounce; Ag: $16.92/troy ounce; Cu: $3.20/pound; Pb: $1.17/pound; and Zn $1.54/pound (all amounts in U.S. dollars).

Minaurum has expanded the strike length of the Europe Guadalupe vein with the newly discovered Europa-Sur Extension.  Additional surface sampling along it returned assays ranging from anomalous up to 1205 g/t Ag, 3.19% Cu, 1.9% Pb and 1.44% Zn.  The Europa-Guadalupe-Sur Vein now measures 2.5km.

#2 - Promontorio Target

Promontorio is a base-metal rich vein zone with an 800 m strike length and drilled to a depth of 200 m. Tested by only two drill holes, it is open along strike to the south and at depth.  The first few holes have successfully tested the Promontorio vein zone, the "Piano-Key" structural model.  Holes AL17-004 and AL17-005 discovered a new mineralized structure that returned highlights of:

  • 20.15 m of 154 g/t Ag, 0.5% Cu, 2.3% Pb, 6.8% Zn; or 694 g/t Ag Equivalent ("AgEq")* in Hole AL17-004.
  • 3.15 m of 322 g/t Ag, 0.47% Cu, 1.65% Pb, 3.29% Zn; or 521 g/t AgEq* in Hole AL17-005.

*Ag Equivalent is reported for comparison only, with no assumptions regarding metal recovery or smelter payments. Prices used are: Au: $1,275.90 per ounce; Ag: $17.09/troy ounce; Cu: $3.13/pound; Pb: $1.10/pound; and Zn $1.50/pound (all amounts in U.S. dollars).

Hole AL17-003 was drilled to the west of Promontorio and intersected a blind brecciated vein from 185.5-186m that assayed 0.10% Cu and 0.29% Zn with anomalous silver. This proves the existence of blind veins in the down-dropped blocks.

Geological cross section showing holes AL17-004 and AL17-005.

 Geological map of the Promontorio Sur and Nueva Europa Sur vein zones, showing copper values in rock samples, Alamos Project. Note U (up) and D (down) symbols indicating relative displacement of fault blocks.

The Promontorio-Quintera extension named “Promontorio Sur” extends for 1 km and is cut-off and down-dropped by a northwest-trending fault from the historic vein that produced in excess of 120M oz silver.  The Nueva Europa extension known as “Nueva Europa Sur” was mapped for over 600m

#3 - Nueva Europa Target

Hole AL17-003 tested the down-dip projection of the southern part of the Nueva Europa vein zone, and intersected a blind brecciated vein/fault from 185.5 - 186.0 m that assayed 0.1% Cu and 0.28% Zn with anomalous silver, confirming the existence of blind veins outside the historic mining area. Mineralized quartz veining was also encountered at 275m in the interpreted down-dip expression of the Nueva Europa vein.

Geological cross section showing hole AL17-003.

 

#4 - "Gap" Target

The Gap Target is a 500m long zone linking the historically producing Quintera and Promontorio Mines. The Gap was never mined and hosts multiple semi-continuous quartz veins.  Mineralization intersected indicates high structural levels, suggesting potential for an undeveloped silver shoot at depth

Hole

From (m)

To (m)

Interval (m)

Ag (g/t)

Au (ppb)

Cu (%)

Pb (%)

Zn (%)

Comment

AL17-006

94.05

110.8

16.75

11.8

11

0.13

0.04

0.05

Promontorio vein/fault zone

A:17-008

201.30

201.65

0.35

185

16

1.05

2.37

1.44

 

229.20

238.8

9.60

88

14

0.24

0.37

0.33

La Travesia Vein

Including

229.75

232.40

2.65

147

24

0.25

0.21

0.28

 #5 - Minas Nuevas Target

At Minas Nuevas Hole AL17-001 cut 17.65 m grading 96 g/t Ag which both confirms Minaurum's bulk tonnage concept and indicates significant potential both down-dip and along strike.

Hole

From (m)

To (m)

Interval (m)

Ag (g/t)

AL17-001

71.95

89.60

17.65

95.9

including

71.95

73.50

1.55

155.0

77.00

78.00

1.00

150.0

80.45

81.45

1.00

279.0

84.45

85.75

1.30

172.0

86.55

89.60

3.05

110.1

AL17-002

76.25

89.30

13.05

53.7

including

85.40

86.90

1.50

181.0

155.55

159.00

3.45

68.1

including

158.55

159.00

0.45

156.3

 

Geological map of the Minas Nuevas area, showing surface projections of drill holes and mineralized intercepts.

#6 - Blind Vein Targets

Historical production occurred in the “up-thrown block” that contains the La Quintera-Promontorio vein system. As the veins on either side of this “up-thrown block” are either exposed at a high level or not exposed at all, they were never mined. Minaurum’s “piano-key" model of testing “down-thrown blocks” for blind veins with no surface expression, has been proven through drilling.

Recent drilling has discovered several blind veins. The nature of the mineralization and the presence of stringer veins suggest that these are high-level intercepts and that the target lies deeper in the structure.

Hole

From (m)

To (m)

Interval (m)

Ag (g/t)

Au (ppb)

Cu (%)

Pb (%)

Zn (%)

Comment

AL17-007

181.1

181.6

0.5

81.1

13

0.92

0.1

0.18

Blind vein – no known surface expression

499.1

500.1

1

218

23

0.42

0.33

0.73

Blind vein – no known surface expression

AL17-003

274.90

275.15

0.25

7.7

25

0.01

0.93

2.38

Blind vein – down dip projection of Nueva Europa vein system, no surface impression

 

#7 - Amalia Target

Lies 450m east of the Promontorio-Quintera vein zone, over a strike length of 500m.

Company

Sample type

Width (m)

Ag g/t

Au g/t

Cu %

Pb %

Zn %

Minaurum

Mine Dump

 

256

0.07

2.14

1.15

0.90

Minaurum

Mine Dump

 

249

14.7

1.00

1.31

1.96

Historical

Mine Dump

3.0

346

1.30

0.86

1.44

1.94

Historical

Mine Dump

3.0

282

4.13

1.55

2.77

1.93

Historical

Outcrop Chip

2.0

41.2

1.03

0.30

1.74

1.55

 

 

#8 - Quintera Target

Historically mined to over 800m strike length and to depths of 500m. Mapping and sampling has defined a new vein running parallel to the principal vein.

Company

Sample Type

Width (m)

Ag g/t

Au g/t

Cu %

Pb %

Zn %

Minaurum

La Covacha adit

1.0

595

0.03

1.11

0.19

0.52

Minaurum

Surface

1.2

1750

0.11

0.67

0.02

0.08

Minaurum

La Covacha adit

1.6

347

0.03

0.76

0.87

2.02

Historical

Surface

3.0

489

0.00

0.54

0.10

0.24

Historical

Surface

2.5

581

0.14

0.96

0.12

0.38

Historical

La Covacha adit

2.5

1160

0.02

1.90

1.44

1.20

 

#9 - Pulpito & Cotera Targets

The Pulpito vein, located 1 km west of the Minas Nuevas target, has been traced for over 800 m and measures up to 2 m wide; outcrop and dump samples along it ranged from 67 to 1495 g/t Ag and 400 ppm to 3.81% Cu. The nearby Cotera vein has been traced for more than 200 m and a topographic linear suggests it extends another 800 m to the north. Sampling along the Cotera vein returned values between 32 and 1370 g/t Ag and 200 ppm to 3.39% Cu.

Table 1. Rock geochemical sampling from Púlpito vein.

Type

Vein

Width
(m)

Ag
g/t

Au
ppb

Cu
%

Pb %

Zn %

Outcrop

Pulpito

1.0

90

36

0.58

2.12

0.28

Outcrop

Pulpito

1.0

146

249

1.42

1.27

0.14

Dump

Pulpito

 

341

76

0.95

1.38

0.13

Chip

Pulpito

1.3

67

6

0.73

1.35

0.65

Dump

Pulpito

 

190

6

0.88

0.71

0.81

Dump

Pulpito

 

1495

14

3.81

0.67

0.21

Chip

Pulpito

1.0

99

2

0.09

0.04

0.03

Outcrop

Pulpito

0.8

164

32

0.10

0.02

0.05

Outcrop

Pulpito

1.2

93

26

0.63

0.30

0.19

Chip

Pulpito

1.4

175

1

0.04

0.03

0.02

Dump

Pulpito

 

197

7

0.16

0.15

0.12

Dump

Pulpito

 

149

18

0.84

0.66

0.12

Table 2. Rock geochemical sampling from Cotera vein.

Type

Vein

Width
(m)

Ag
g/t

Au
ppb

Cu
%

Pb %

Zn %

Float

Cotera

 

1370

33

3.39

0.14

0.22

Adit Channel

Cotera

1.8

116

9

0.46

0.53

0.79

Channel

Cotera

0.6

32

6

0.02

0.05

0.09

Channel

Cotera

1.2

330

18

0.32

0.07

0.16


Figure 1. Newly added concessions and vein zones, Alamos Project.


Figure 2. Geological map of the Túnel del Agua and Ampliación Túnel del Agua concessions, showing traces of Púlpito and Cotera veins, Alamos Project.

#9 - Ana Vein Target

The Ana vein is located lies in a fault between limestone on the east side and down-dropped andesite on the west side, indicating displacements similar to those where significant mineralization occurs at depth at the La Quintera, Promontorio, and Europa-Guadalupe veins. Preliminary geochemical sampling of the vein zone has yielded assays up to 24 g/t Ag.

Reconnaissance mapping shows that the El Pilarón concession is underlain by felsic lithic tuff and quartz monzonite. It is the subject of active detailed mapping and sampling.


Figure 3. Geological map of the Ana and El Pilarón concessions, Alamos Project. Geology mapped by J.R. Gallardo (1988).

 

Land Package

16,445-ha Land Package

Minaurum's Alamos Silver Project in Mexico has a total land package of 16,134-has.

Outlook

Minaurum has drilled 2,770 metres of a budgeted 5,000-metre program at Alamos.  Minaurum is continuing with extensive mapping and sampling to generate several drill targets.

Alamos Permits

The Alamos project is situated on land belonging to the ejidos of La Aduana and Tetajiosa and the community of Minas Nuevas. Exploration agreements are in place with all three along with annual rental payments to maintain the agreements.

An Environmental Impact Statement (MIA) was obtained from the Secretariat of Environment and Natural Resources (SEMARNAT) in 2012, to conduct exploration on the La Aduana and Tetajiosa lands. The MIA activities include surface exploration, including sampling and construction of drilling pads, rehabilitation of existing mines for exploration and exploitation purposes, temporary stockpiling of rock material, and haulage of extracted material by truck off-site for process and the recovery of ore. 

Part of the Alamos project lies within the Sierra de Alamos – Río Cuchujaqui Reserve, which overlaps ejido lands. Authorization was received from the National Commission of Natural Protected Areas (CONANP) to explore in the Reserve Area. The reserve area land inside the project area is categorized as an “area of sustainable exploitation of natural resources”, which is defined in the reserve area management plan as use that does not negatively affect future generations. A coordination agreement between the Protected Area authorities and SEMARNAT was established in July of 2013 and is valid for the life of the project.