Sold to Goldgroup Mining Inc.
For details of the sale, please see Almaden's release of October 17th, 2011

For updates on the Caballo Blanco Project, please visit Goldgroup's webpage at http://www.goldgroupmining.com/s/caballoblanco.asp

Please note: the Central Grid Zone -- renamed El Cobre Project -- has been carved off the Caballo Blanco project and is 100% owned by Almaden Minerals.

 

overview | geology | target zones| HIGHWAY ZONE | NORTHERN ZONE | past work

 

The Caballo Blanco Project is located in the state of Veracruz on the gulf of Mexico, approximately 75 km northwest of the city of Veracruz. The property is accessible by the Pan American Highway, which crosses the east edge of the project. Main power grids and a gas line cross the project area as well. The project consists of seven mineral concessions totalling over 10,000 hectares.

 

The alteration and mineralisation on the property indicates the potential for a high-sulphidation gold deposit in the northern and eastern portions.

The property occurs within a north-south belt of alkalic igneous rocks which are typical of the mineralisation associated with back-arc environments, known as the Eastern Alkalic Province (EAP). The geologic setting of the alkalic rocks of the EAP is very similar to that of alkalic rocks that host deposits such as the world class Lihir and Porgera gold deposits of Papua New Guinea, the Grasberg and Bingham porphyry copper-gold deposits of West Papua and Utah respectively, and the Cadia and Goonoombia porphyry copper-gold deposits in Australia. A literature review of such rocks in east-central Mexico led to the recognition of the Caballo Blanco project. A subsequent visit to the project area resulted in the discovery of quartz veining and argillic alteration in a highway cut which returned anomalous gold values.

Prospecting has outlined several zones of alteration, mineralisation and anomalous gold values. Please note: The Central Grid Zone is now El Cobre Project.

Click on map to enlarge +

Highway Zone [go +]

Northern Zone [go +]

 

The Highway Zone covers a 4.5 by 5 kilometer zone containing a classical epithermal alteration pattern consisting of an innermost silica core (massive to vuggy quartz), to quartz-alunite, kaolinite, to a propylitic alteration. (see diagram of this patterning + ) In a highway cut, an approximately 100 meter wide zone of stockwork quartz veining and acid-sulphate alteration is exposed. Samples from this outcrop have assayed as high as 8 g/t gold.

Click map to enlarge +

The work carried out by Comaplex in the Highway Zone consisted of sampling, geologic mapping and induced polarization (IP) geophysics and was complimented by analysis of alteration mineralogy with a PIMA portable infrared spectrometer. The combined information has outlined several prominent areas of alteration and mineralisation, which are indicative of a large high-sulphidation epithermal system. A significant resistivity and chargeability anomaly is coincident with the vuggy silica and alterations.

IP Survey: An Induced Polarization geophysical survey was conducted on two lines in 2003. See maps to right.

Each Image displays 6 sections, the top three of which represent the resistivity response and the bottom three the chargeability response. The bottom section of each represents the data "inverted" to reflect the best interpretation of the real distribution of resistivity and chargeability responses respectively. These bottom images also take into account topography.

Silicification (when acid fluids dissolved everything in the rock except the silica) results in a high resistivity feature (thought to be represented in the resistivity sections by the grey areas). Concentrations of sulphides result in a high chargeability response which is a measure of how long the charge takes to decay. This is thought to be represented in the chargeability sections by the warmer colour, the highest values being pink.

Drilling: In 2001, Noranda completed a diamond drill hole close to the area. This hole was drilled in an area of extensive argillic alteration and had several interesting gold intersections. These included stockwork veining from 51.35 to 84 meters depth within which a 6 meter section averaged 1.42 g/t gold. A sample from 192 to 195 meters depth within a zone of lower temperature argillic alteration averaged 2.5 g/t gold and the final sample of the hole from 212.0 to 212.5 meters depth returned a gold value of 4.98 g/t gold. The hole was lost at this point due to poor drilling conditions.

MAPS for Highway Zone
IP Sections
Line 5400	Line 7400

 

The alteration in the Northern zone is very similar to that in the Highway zone. In the northern extreme of the property, mineralised and altered float were identified in stream beds draining an east-west ridge of intensely argillic altered and silicified volcanic rocks, both indicator minerals for epithermal gold systems. This area is also very steep as can be seen in the photograph below.

Work carried out by Comaplex in the Northern Zone consisted of sampling, geologic mapping and PIMA analyses and have defined the area of acid sulphate alteration and vuggy silica, including many breccia bodies - roughly 6 by 5 kilometers in size - containing vuggy silica. Map includes all work done up to 2006. Click map to enlarge +

Rock sampling by Comaplex returned anomalous gold values from outcrop the highest being 1 g/t.

The two IP sections over a northern section of the zone outlined a large high resistivity feature that appears to extend to depth and is associated with significant chargeability. The large resistivity high in IP Line 84500 (located along the top of the ridge and represented by the grey areas) was coincident with rock samples as high as 4.7g/t gold.

Note: Each Image displays 6 sections, the top three of which represent the resistivity response and the bottom three the chargeability response. The bottom section of each represents the data "inverted" to reflect the best interpretation of the real distribution of resistivity and chargeability responses respectively. These bottom images also take into account topography.

A stream sediment sampling program over the Northern Area in conjunction with further prospecting of the drainages was conducted in 2003 to better define the source of the mineralised float. Several drainages returned highly anomalous gold, arsenic and copper values in stream sediment. Several zones of weathered vuggy silica float were identified, generally occuring with acid-sulphate altered volcanic rocks. (see map above). Samples of this material returned gold values up to over 600 ppb gold. Fragments of quartz-barite vein material and breccias containing clasts of vuggy silica, returned values as high as 11 g/t gold. The highest gold values were returned from the peak of Cerro la Cruz (pictured below).

image: [enlarge +] taken from Comaplex's website

2008 DRILLING on NORTHERN ZONE:

Canadian Gold Hunter commenced a drill program in November 2007 on the Cerro la Paila target in the Northern Zone. This is a high-sulphidation alteration system comprising strong vuggy silica, quartz-alunite and various clay minerals extending over 20 square kilometers. The program commenced with one drill rig. A second rig was added in February 2008. A total of 7,000 meters of drilling are planned. To date, 15 holes have been drilled with another 2 holes currently in progress.

The program has been designed to test the resistivity high (outlined in orange) running north-south through the center of the Northern Zone. Six holes were drilled at the north end of the high in 2005 and 2006 with very encouraging results, and in 2007 the resistivity anomaly has been traced southwards for about 800m.

The Cerro la Paila Target represents just a one of several massive and vuggy silica targets (red areas) occurring both in the Northern Zone and Highway Zones, and the only one to have been drill tested to date.

Highlight holes from 2008 Drilling program include:

08CBN-004 intersected 94.5 meters grading 2.09 g/t gold, including 39.62 metres grading 3.93 g/t gold, in iron-oxide-cemented silica breccias. The hole was abandoned due to difficult drilling conditions in massive silica breccia at 203.61 meters.

07CBN-003 intersected 1.04 g/t gold over 82.30 meters including 16.77meters grading 2.63 g/t gold in an iron-oxide-cemented silica breccia. The hole was lost in a fault zone at a depth of 246.9 meters.

See News Release of April 22nd, 2008, June 5th, 2008, and July 31st, 2008 for more detailed discussion of results.

Click here to read overview of 2008 program +

 

 

August 11th, 2011

Almaden is pleased to report to its shareholders the results contained in a news release of Goldgroup Mining Inc. in which Goldgroup announced that additional diamond drill holes at the Company’s Caballo Blanco gold project in Veracruz, Mexico have yielded significant gold intercepts, extending the La Paila oxide gold zone to the southwest. Goldgroup also reported that drilling at Caballo Blanco remains ongoing to define and to expand the eastern, southern and southwestern flanks of the La Paila gold zone as the zone currently remains open in these directions. Highlights from the Goldgroup News Release include:

Drillhole DDH 11 CBN 108: 84.77 m @ 0.71 g/t Au
Drillhole DDH 11 CBN 112: 71.50 m @ 0.51 g/t Au
Drillhole DDH 11 CBN 116: 94.80 m @ 0.53 g/t Au

Read entire news release: August 11th, 2011

 

May 25th, 2011:
Almaden is pleased to report to its shareholders the results contained in a news release of Goldgroup Mining Inc. in which Goldgroup announced the intersections tabularised below from the La Paila Zone of the Caballo Blanco Project and highlighted by the following intercepts:

DDH 11 CBN 79:  100.10 m @ 0.88 Au
DDH 11 CBN 82:  154.00 m @ 0.59 g/t Au
DDH 11 CBN 84:  64.00 m @ 1.20 g/t Au

Read entire news release: May 25th, 2011

 

April 20th, 2011:
Almaden is pleased to report to its shareholders the results contained in a news release of Goldgroup Mining Inc. in which Goldgroup announced the intersections tabularised below from the La Paila Zone of the Caballo Blanco Project and highlighted by the following intercepts:

DDH 10 CBN 54:  91 m @ 0.70 Au (and 67 m @ 0.82 g/t Au)
DDH 11 CBN 68:  134 m @ 0.61 g/t Au
DDH 11 CBN 72:  122 m @ 0.80 g/t Au

Read entire news release: April 20th, 2011

 

April 7th, 2011:
Almaden is pleased to report the results contained in a news release of Goldgroup Mining Inc. (TSX:GGA; “Goldgroup”; see Goldgroup news release of April 7, 2011) in which Goldgroup announced the following intersection at the La Paila Zone: Hole 10 CBN 73: 48.50 meters @ 3.47 g/t gold from 130.00 to 178.50 meters depth.
Read entire news release: April 7th, 2011

 

December 1st, 2010:
Goldgroup Announces First Caballo Blanco Drill Results.
Almaden is pleased to report to its shareholders today the results contained in a news release of Goldgroup Mining Inc. These results are from the first two reverse circulation (“RC”) drill holes, #10CBRC48 (“48”) and #10CBRC49 (“49”) drilled at the La Paila zone of the Caballo Blanco project and include an interval of 62 meters averaging 0.75 g/t gold (see table below). Goldgroup reports that Hole #48 was drilled to confirm the grade from the 32 diamond drill holes drilled in the La Paila zone prior to Goldgroup assuming operating control of Caballo Blanco and to obtain large samples for column leach testing. Goldgroup reported that the results from hole #48 showed a high degree of correlation to the previous drilling. The hole was terminated in mineralization above the cut-off grade (0.2g/t) at a depth of 217 meters due to poor drilling conditions in very broken rock. Goldgroup reported that Hole #49 was drilled 50 metres east of known mineralization and that the extent of mineralization in hole 49 may indicate that the mineralized zone appears to be wider than previously modelled in the La Paila zone. Read more: December 1st, 2010

October 22nd, 2010: Goldgroup Announces Caballo Blanco Drilling Underway
Goldgroup Mining Inc. has announced that drilling has now commenced on Almaden’s Caballo Blanco project as part of Goldgroup’s US$8.5 Million 30,000 metre drilling and exploration program previously described by the Company in its news release of September 14, 2010. J.D. Poliquin, chairman of Almaden, commented, “We are very pleased to hear of the commencement of drilling at Caballo Blanco. It has been well over a year since there has been drilling at Caballo Blanco, despite a new discovery having been made. The Caballo Blanco and nearby El Cobre projects are both underexplored and highly prospective projects in our portfolio. We are excited with Goldgroup’s plans for Caballo Blanco and look forward to reporting them.”
Read more: October 22nd, 2010

September 14th, 2010: Goldgroup Announces Caballo Blanco Exploration Program
Goldgroup Mining Inc. has announced the details of a US$8.5 Million drilling and exploration program due to commence near the end of September on Almaden’s 100% owned Caballo Blanco gold project. Goldgroup reports that the 30,000 metre multi-drill diamond and reverse circulation drill program has been designed to expand and upgrade the current NI 43-101-compliant mineral resource estimate at the La Paila anomaly of the Northern Zone and to test other highly prospective areas for mineralization, including targets at the Red Valley and Highway zones. Many targets on the property, including those in other parts of the Northern Zone, Red Valley and Highway zones, have not been tested by past drilling.
Read more: September 14th, 2010

February 6th, 2009: 36.6 metres grading 1.13 g/t GOLD intersected at Caballo Blanco
Almaden is pleased to report that it has received additional assay results from the Cerro la Paila gold target and of its Caballo Blanco project in Veracruz, Mexico from operating partner Canadian Gold Hunter Corp. Core hole 08CBN-029 intersected 36.58 metres grading 1.13g/t Au (grams gold per metric ton) on the Cerro la Paila gold target in the Northern Zone. CGH has reported that the drill program is testing the Cerro la Paila gold target using two track-mounted core rigs. The initial program of 24 holes (5,000 m.) will infill Cerro la Paila on 50-metre sections and test two other high-sulphidation gold targets in the Northern Zone – Cerro la Cruz and Cerro Bandera. [read more +]

November 27th, 2008: Drilling Recommences
Almaden is pleased to announce the commencement of diamond drilling on the Caballo Blanco gold project in the state of Veracruz, Mexico. Two track-mounted core rigs have been mobilized to the property by operating partner Canadian Gold Hunter. The planned program is up to 10,000 meters in two phases, with the initial phase being 5,000 meters. [read more +]

September 2008: 54.86 metres grading 1.31 g/t Gold Intersected at Caballo Blanco Almaden has received additional assay results from the Cerro la Paila gold target and the Pedrero and Porvenir porphyry gold-copper targets on Caballo Blanco from operating partner Canadian Gold Hunter. Core hole 08CBN-018 intersected 13.72 meters grading 3.21 g/t gold within a broader 54.9 metre interval grading 1.31g/t gold in iron-oxide-cemented, vuggy silica breccias on the Cerro la Paila gold target in the Northern Zone. In addition, thick copper-gold intercepts are reported for eight holes in two porphyry copper-gold targets on the Central Grid. The drilling at the Pedrero target is the first to have been conducted in this area and returned 41,15 meters grading 0.42 g/t Au and 0.27% Copper to the end of the hole which was lost at 187.45 meters. Below are significant assays from this latest drilling in tabularized form.

For an overview of the 2008 CERRO la PAILA drilling program, please click here +

July 2008: 64.01 meters grading 1.02 g/t Gold at Caballo Blanco
Almaden has received additional assay results from the Cerro la Paila gold target of its Caballo Blanco project in Veracruz, Mexico from operating partner Canadian Gold Hunter Corp. Core hole 08CBN-017 intersected 64.01 metres grading 1.02 g/t Au (grams gold per metric ton) in iron-oxide-cemented, vuggy silica breccias. The hole was drilled to 227.99 meters; however assays have only been received for the top 145.69 metres. 08CBN-012 was drilled to a depth of 227.08 meters, where the hole was abandoned due to a loss of circulation in cavernous vuggy silica breccias. The bottom 16.77 meters of the hole, which had very poor core recovery, assayed 3.15 g/t Au, within an interval that graded 0.99 g/t Au over 61.0 metres. [read more +]

June 2008: 80.8 meters grading 1.23 g/t Gold & 89.9 meters grading 1.11 g/t Gold intersected Additional assay results from the Cerro la Paila gold target of its Caballo Blanco from operating partner Canadian Gold Hunter Corp:

Core hole 08CBN-008 intersected 80.8 metres grading 1.23 g/t Au (grams gold per metric ton) in complex iron-oxide-cemented, vuggy silica breccias. The hole was abandoned in bad ground in vuggy silica breccia at 213.66 meters. The last 20.11 meters of the hole grades 0.90 g/t Au. 08CBN-009 was drilled to a depth of 135.03 meters, where the hole was abandoned due to a total loss of circulation in cavernous vuggy silica breccias. The bottom 16.77 meters of the hole assayed 1.35 g/t gold, with the last two assays (3.05 m.) averaging 2.35 g/t Au. 08CBN-011 was drilled to a depth of 189.89 metres, where the hole was abandoned due to loss of circulation in vuggy silica breccia. The last 89.92 metres grades 1.11 g/t gold despite having two 3.05 metre intervals with no recovery that were given a gold grade of zero. [read more +]

 

April 2008:
94.49 Meters Grading 2.09 g/t GOLD Intersected at Caballo Blanco
Almaden Minerals is pleased to report that it has received assay results from core holes 08CBN-004 and 08CBN-005 from operating partner Canadian Gold Hunter Corp. from the Cerro la Paila gold target. Core hole 08CBN-004 intersected 94.5 meters grading 2.09 g/t Au, including 39.62 metres grading 3.93 g/t gold, in iron-oxide-cemented silica breccias. The hole was abandoned due to difficult drilling conditions in massive silica breccia at 203.61 metres. Drill hole 08CBN-005 was completed to a depth of 273.71 meters, where it was abandoned in bad ground in silica breccias. The hole assayed 0.53 g/t gold over a length of 131.06 metres, within which a higher grade section grades 1.08 g/t gold over 24.38 meters. [read more +]

 

November 2007:
Drilling to Commence on the Northern Zone
Past work on the Caballo Blanco gold property, including excellent drill intersections, resulted in the development of exciting drill targets. The primary target at Caballo Blanco is a high-sulphidation gold deposit identified and only partly explored by a previous operator. Drilling will commence on the Northern Zone, a high-sulphidation alteration system comprising strong vuggy silica, quartz-alunite and various clay minerals extending over 20 square kilometers.

Within the Northern Zone, earlier drill intercepts at Cerro la Cruz reported by a previous operator in 2005 and 2006 graded 1.14 g/t Au (grams per metric ton gold) over 108 meters in DDH-05CB-03, 1.0 g/t Au over 92.7 meters in DDH-06CB-01 and 1.70 g/t Au over 76.0 meters in DDH-06CB-03. The principal focus of drilling in the current program will be the Cerro la Cruz target, utilizing much-improved road access. To this point, Cerro la Cruz has been drilled from only one isolated site. [read more +]

July 2007:
NEW Copper-Gold Porphyry Zone
A NEW Copper-Gold Porphyry Zone has been discovered two and one-half kilometres north of the Central Grid Zone, where porphyry copper-gold mineralization is known to occur. 23 rock samples (outcrop and float) were taken within an 800 by 400 meter area underlain by the quartz stockwork and alteration. These samples returned up to 1.5 g/t gold and 0.15% copper and averaged 0.18 g/t gold and 213 ppm copper. Five four-kilometer lines, spaced 400 meters apart, were surveyed with induced polarization (“IP”) and ground magnetics. Results from the IP geophysical survey detected a chargeability anomaly two kilometres east-west by at least 1.5 kilometers north-south.

Soil samples were collected on 50-meter spacing along each line.  Sixteen consecutive soil samples over the surface of the buried IP anomaly returned an average of 128 ppb gold (ranging from 41 to 400 ppb gold), 342 ppm copper (ranging from 57 to 1435 ppm copper) and 15 ppm molybdenum (ranging from 7 to 35 ppm molybdenum). The alteration and mineralization are interpreted to be representative of a high level of exposure in a porphyry copper-gold system. [read more +]

April 2007: Almaden options Caballo Blanco to Canadian Gold Hunter. [more +]

March 2007: The first phase of Almaden's 2007 geologic mapping, soil sampling and induced polarization (“IP”) geophysical program is complete. The work has identified previously unrecognized areas of alteration and mineralization as well as geophysical features that are interpreted to represent new feeder zones similar to that intersected in past drilling. [more +]

February 2007: Almaden is pleased to announce that it has purchased Comaplex’s 60% interest in Caballo Blanco for a cash payment of US$1.25 Million. [more +]

January 2007: Almaden completes a joint venture agreement with Comaplex, which earned a 60% interest in Caballo Blanco in 2006 by meeting its exploration spending requirements. The terms of the joint venture allow Almaden to be the operator of the 2007 program. Almaden is currently preparing a budget, which will include extensive surface exploration and further diamond drilling. [more +]

August 2006: Results from Comaplex's drill program in the Cerro la Cruz area of the Northern Zone have been received. Due to drilling difficulties two of the three holes had to be terminated before they reached their intended depths. All three holes encountered more massive silicification that seems to grade with depth into more brecciated and vuggy silica bodies. Almaden considers the following results to be highly encouraging. It should be emphasized that the Cerro la Cruz area represents one of several massive and vuggy silica zones within the Northern Zone. [more +]

Drillhole CB05-1 was vertical and reached a depth of 136.5 meters. This hole encountered largely massive silica to 76 meters at which point more vuggy material was intersected. The entire length of this hole (136.5 meters) averaged 110 ppb gold while the first 22 meters sampled (2 to 24 meters depth) averaged 216 ppb gold.

Drillhole CB05-2 also encountered massive and vuggy silica bodies but was lost at the shallow depth of 72 meters. This hole encountered increasing gold values to the end of the hole in both massive and vuggy silica. The entire 72 meters of this hole averaged 295 ppb gold with the last 14.85 meters averaging 477 ppb gold where the hole ended.

Drillhole CB05-03 was the only hole completed to its intended depth which was 314 meters. A section of massive and vuggy silica was intersected from the collar to 200 meters where clay altered volcanic rock was encountered to the end of the hole. This entire section (from the top of the hole to 214 meters) averaged 700 ppb gold. Within this section a zone of strongly brecciated and vuggy silica was encountered, a 108 meter section of which (from 66 meters to 174 meters depth) averaged 1.14 g/t. This includes a 40 meter section from 74 to 114 meters depth which averaged 2.35 g/t gold.

April 2006: A follow-up drill program designed to further test the northern zone is now underway. [more +]

August 2005 : Comaplex completes a 3 hole drill program totaling 523 meters. The holes were setup on the top of Cerro la Cruz in the Northern Zone. A total of 1,500 meters was planned, but Comaplex was unable to complete the program and two of the three holes were terminated before they reached their intended depths. Hole CB05-03 intersected a 200 meter zone of clay altered volcanic rock and averaged 700 ppb gold, which included a 40 meter section from 74 to 114 meters depth which averaged 2.35 g/t gold. [more +]

February 2005 : A program using a man-portable diamond drill rig is currently planned. Utilising this equipment is anticipated to greatly reduce the difficulties in access and road building encountered in the past due to very hard and rocky ground conditions. [more +]

November 2004

The 2004 drill program consisted of four holes, one of which (CB04-01) was drilled in the Central Grid Area to follow up on two holes from 1998 which intersected porphyry copper-gold mineralization. . Hole CB04-01 intersected mineralisation typical of a porphyry copper setting along the entire 298 metre length of the hole. The entire length averaged 380 ppb gold (0.38 g/t) and 0.16% copper including two higher grade intervals: 56 meters of 844 ppb (0.84 g/t) gold and 0.34% copper and 24 meters from 172 to 194 meters averaging 887 ppb (0.89 g/t) gold and 0.28% copper (includes a 10 meter interval averaging 1672 ppb (1.7 g/t) gold and 0.49% copper). The other three holes were drilled in the Highway Zone. Drilling on the Highway zone has yet to test the principle targets of interest, (areas of vuggy silica and intense alteration), although the 3 holes drilled in 2004 to the south of the targets intersected anomalous gold values including an interval of 217 ppb (0.22 g/t) gold over 16 meters.