Conclusions from ECU's NI43-101 posted on Sedar yesterday
posted on
Jan 28, 2009 02:56PM
Golden Minerals is a junior silver producer with a strong growth profile, listed on both the NYSE Amex and TSX.
19.0 INTERPRETATION AND CONCLUSIONS With the conclusion of its latest exploration program ECU has been able to conduct a second mineral resource estimate on its Velardeña properties. ECU has begun to outline a mineral resource base on the Velardeña properties which has the potential for the discovery of additional resources and may, with further study, be potentially economic. Micon has conducted a review of ECU’s second mineral resource estimate for the Velardeña properties. Micon considers the resource estimate, compiled by ECU and reviewed by Micon, to have been reasonably prepared and to conform to the current CIM standards and definitions for estimating resources, as required under NI 43-101 “Standards of Disclosure for Mineral Projects.” Therefore, Micon accepts ECU’s resource estimate as the basis for ongoing exploration and development on the Velardeña properties. However, the reader should be cautioned that mineral resources that are not mineral reserves do not have demonstrated economic viability The parameters used to determine the cut-off grades are based on the economical criteria presented below which were then used to determine which mineralized blocks could be included in the resource estimate. The lead and zinc mineralization for those blocks located within the oxide portion of the veins was not taken into account in the estimation of the silver equivalent cut-off. Blocks below the cut-off grades were reviewed and were occasionally used in the estimate to preserve continuity. Blocks which were not included in the current estimate may be included in future estimates should the economic and/or metallurgical criteria change sufficiently to warrant a review of the cut-off grades. Criteria used for the cut-off grade determinations include the commodity prices and operating costs established by ECU, and recoveries for gold, silver, lead and zinc also determined by ECU from its Velardeña operation and current contracts with smelters. The resource estimates are based on an NSR value cut-off of US $45/t for the individual veins and US $25/t for the vein packages or veins with average widths of 2.7 m or more. Table 19.1 summarizes the assumptions used to determine the silver equivalents. Table 19.1 Summary of the Assumptions used for the Silver Equivalents Recovery Sulphides (%) Commodity Price (US $) High Lead/Zinc Veins Low Lead/Zinc Veins Bulk Tonnage Areas Chicago San Diego Recovery Oxides (%) Gold $775/oz 72 69 65 69 44 78% Silver $14/oz 60 59 57 65 65 55% Lead $0.90/lb 67 59 55 54 73 n/a Zinc $1.28/lb 44 24 46 36 48 n/a Table provided by ECU Silver Mining Inc. *Recovery includes allowances for both mill recovery and smelter terms. Micon’s review of the ECU mineral resource estimate is contained in Tables 19.2 for Measured, Indicated an Inferred Resources. 129 Table 19.2 Summary of the Measured, Indicated and Inferred Mineral Resource Estimate for the Velardeña Properties as of November 15, 2008 Vein or Grade of Mineralization Zone Type of Mineralization Resource Category Tonnes Gold (g/t) Silver (g/t) Lead (%) Zinc (%) Silver Equivalent (oz) (Gold + Silver) Silver Equivalent (oz) (Lead & Zinc) Measured 668,000 3.36 156.3 9,026,000 Indicated 407,000 2.27 172.4 4,587,000 Oxides
Total Measured + Indicated
1,075,000 2.95 162.4 13,614,000
Inferred 379,000 1.68 186.2 3,882,000 Measured 2,205,000 1.84 86.1 0.26 0.45 14,579,000 1,644,000 Indicated 669,000 2.80 205.1 0.91 1.00 8,293,000 1,576,000
Total Measured + Indicated
2,874,000 2.06 113.8 0.41 0.58 22,872,000 3,220,000
Total All
Veins
Sulphides
Inferred 26,141,000 2.07 158.4 1.74 2.11 244,228,000 142,914,000
Grand Measured + Indicated
3,949,000 2.31 127.0 36,486,000 3,220,000
Total Inferred
26,520,000 2.06 158.8 248,109,000 142,914,000
Table provided by ECU Silver Mining Inc.
The above table includes the 50% of the resources attributable to ECU from the San Diego property which is subject to a joint venture agreement between
ECU and Golden Tag.
For the Velardeña properties ECU has currently developed a measured and indicated mineral
resource of 3.9 million tonnes containing 36.5 million ounces of silver equivalent if only gold
and silver are accounted for, and a further 3.2 million ounces of silver equivalent if lead and
zinc are accounted for as well as the gold and silver in the sulphide mineralization. In addition
to the measured and indicated resources ECU has a further inferred resource of 26.5 million
tonnes containing 248 million ounces of silver equivalent if only gold and silver are accounted
for, and a further 142 million ounces of silver equivalent if lead, and zinc are accounted for as
well as the gold and silver in the sulphide mineralization. ECU’s mineral resource estimate
includes its 50% attributable portion of the resources located on the San Diego property where
it has a joint venture agreement with Golden Tag.
Mineral resources that are not mineral reserves do not have demonstrated economic viability.
There are no mineral reserves presently identified on the Velardeña properties.
The stated resources are not materially affected by any known environmental, permitting,
legal, title, taxation, socio-economic, marketing, political or other relevant issues, unless stated
in this report, to the best knowledge of the author. There are no known mining, metallurgical,
infrastructure, or other factors that materially affect this mineral resource estimate, at this time.
In addition to the previously stated mineral resource estimate, the Velardeña properties have
further mineral potential since the true extent of the mineralization within the veins, vein
packages and skarn has not been fully identified. However, since the mineral potential cannot
be estimated to the same accuracy as a mineral resource it must be stated as a range of figures.
To estimate the range for grades, a factor of minus 10% was applied for the downside and plus
10% for the upside potential. In the potential for the extensions of the veins belonging to the
Santa Juana vein system where the grades were used from the drill holes only, the upside was
set at plus 50%. The upside potential factor is larger than the downside potential factor
because of the possibility that the mineralized zones will be similar in nature to, and as
extensive as, the main veins on the Velardeña properties. Consequently, a significant
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difference between the grades obtained from drilling and the higher grades indicated from
stoping would be expected.
Contributing to the upside potential on the Velardeña properties is the possibility that
additional veins may be discovered. While it is easy to determine the extent of the veins
which outcrop on surface, there is the possibility that a number of hidden veins exist on the
property which do not have a surface expression and would only be discovered through
diligent exploration and, in some cases, discovered while drifting to intersect known veins
underground.
Table 19.3 summarizes the mineral potential ranges for the Velardeña properties
Table 19.3
Summary of the Mineral Potential Ranges for the Velardeña Properties
Mineral
Potential
Range
Mineral
Potential
(X000 t)
Average Gold
Grade (g/t)
Average Silver
Grade (g/t)
Potential Contained
Silver Equivalent (X000
oz) (Gold + Silver)
Potential Contained Silver
Equivalent (X000 oz) (Gold,
Silver, Lead, Zinc and Copper)
Minimum 41,692 2.83 207 569,524 747,982
Maximum 87,186 2.06 167 930,400 1,252,487
Table provided by ECU Silver Mining Inc.
The mineral potential of the Velardeña properties is conceptual in nature and there has been
insufficient exploration conducted within the properties to define a mineral resource for these
areas. It is also uncertain if further exploration will result in targets being delineated as
mineral resources. Thus ECU is proposing to continue its multi-phase exploration program,
started in 2008, to test the mineral potential of the properties.
Micon believes that the land controlled at the Velardeña properties by ECU is highly
prospective both along strike and down dip of the existing mineralization and that further
resources could be discovered with additional exploration and development.
19.1 CONCLUSIONS
ECU has been conducting exploration drilling and underground drifting on the mineralization
on the Velardeña properties which have had some historical and recent mining conducted on
the various mineralized veins. In the case of the Velardeña properties, although a number of
mineralized areas have seen exploitation in the past and more recently, the veins on the
properties remain open in both their lateral and down dip projections. ECU has continued to
conduct extensive exploration drilling and underground drifting along the mineralization on
the Velardeña properties and from the results has been able to complete its second mineral
resource estimate.
The resources reported herein by ECU for the Velardeña properties were reviewed and
accepted by Micon as constituting the basis for further exploration and evaluation programs on
the properties. It is Micon’s opinion that the resources for the Velardeña properties conform
to the current CIM standards and definitions for estimating resources as required under NI 43-
101 regulations.
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At this time the exploration potential of the Velardeña properties remains conceptual.
However the geology, extent of the surface expression of the main veins and potential to find
further hidden veins within the properties provide reason to believe that the conceptual
mineral potential could be significant. Prior to ECU’s involvement, the Velardeña properties
had never been completely subjected to modern exploration concepts and technology and to
date ECU has been able to expand upon the known areas of mineralization and discover new
areas