ECU Silver Mining
An Extraordinary Junior Mining Company – JULY 2008
UPDATE
By Adrian Douglassource www.lemetropolecafe.comDeep Encounters of the First Kind!In October 2006 I wrote an extensive article on ECU Silver Mining which
discussed at length the geological setting and the exploration potential of the
company (ECU Silver Mining – An Extraordinary Junior Mining Company.
http://www.lemetropolecafe.com/pfv.cfm?pfvID=5676).
accessible en lecture publique,
iciI am now writing an update to that article because the company is on the verge
of what could be an event of epic proportions in the company’s evolution. In
that article I said:
“The geological phenomenon associated with intrusives suggests there could
be a real bonanza as the exploration goes deeper in Velardeña. Already more
numerous veins have been encountered with increasing depth, including the
discovery of new stockwork zones, and the vein width and grades are increasing
with depth. As the skarns are explored further, there is also the possibility of
encountering massive sulfide lenses which are typically found near the
intrusive/skarn contact”That was written almost two years ago so I was very excited to read the press
release made by ECU on July 2, 2008.
“ECU Silver Deep Drilling Encounters Mineralization at Depth at Santa
Juana”
http://www.ecu.ca/s/NewsReleases.asp?ReportID=309848&_Type=News-Releases&_Title=Ecu-Silver-Deep-Drilling-Encounters-Mineralization-At-Depth-At-Santa-JuanaInvestors will very shortly find out if the company has indeed hit the
“mother lode” of its exploration potential that I postulated could be the real
“bonanza’ of the Velardeña property if the geological model is correct.
Judging by the recent stock performance investors are not paying attention to
this potentially game-changing exploration activity. I would like to point out
why this deserves serious consideration by the investment community.
To understand the significance of the latest deep exploration drilling let’s
make a recap on the geological environment with some excerpts taken from my 2006
article.
Talking Geology – “Intrusions” are welcome! – Especially the Second Time
Around!The geological environment of the Velardeña region is very complicated. The
source of the silver, gold and base metal deposits is from magma intrusions that
thrust their way into the overlying limestone formations to create what is known
as a “skarn”. Understanding the geological model, even at a rudimentary level,
is absolutely essential to understanding the vast potential that ECU has to add
resources and reserves, and why it is an extraordinary situation.
During the Cretaceous age (between 135 million years ago to 65 million years
ago), in what was then a marine environment, calcareous sedimentary deposits
(limestone) were laid down which over time and with burial formed massive
limestone layers.
In the Central Mexico region where Velardeña is located, toward the end of
the Cretaceous geological age, in a period known as the Laramide Orogeny,
tectonic activity caused the limestone layers to be buckled into mountains and
valleys and also caused extensive faulting and fracturing. This was a very high
energy geological event which gave rise to the Rocky Mountains and the Sierra
Madre mountain ranges, which can be seen to have been folded in a NW-SE
alignment. This immense disturbance of the earth’s crust gave rise to a period
of magmatism and volcanic activity. The liquid magma was squeezed through cracks
and faults in the overlying rocks. When the magma escapes to surface it is
“extrusive’, which we know as a volcano, while if the magma is contained within
the rock it is “intrusive”.
A generalized schematic of an acid magma intrusive is shown in Figure 1.
The magma intrusive is acidic in nature and extremely high temperature (300
to 500 degrees Celsius). The hot, acidic intrusive reacts with the overlying
limestone in a complex geochemical reaction. The contact zone between the magma
and the limestone is a zone of intense metamorphosis and the chemically altered
rock is called “skarn”. As the intrusive magma continues to force its way into
the limestone, it causes uplifting which leads to radial cracks or fractures as
shown in Figure 1 in the plan view. There may also be other cracks or faults in
the rock that were pre-existing before the magma intrusive event.
At this stage hydrothermal alteration may occur. Superheated aqueous fluids
are created by the heat of the intrusive magma and underground water and
volatile fluids that come from the magma. These fluids dissolve metals and
minerals and concentrate them. These hot fluids percolate through the fractured
limestone rock depositing the minerals and creating the mineralized veins by
filling the fractures. This percolation may continue for hundreds of thousands
of years.
The crystallization of minerals occurs in the fractures at shallower depth
first as this is the coolest environment. The dissolution of the limestone wall
of the fractures in the hydrothermal alteration process is most aggressive near
the intrusive because the circulating fluids attain their highest temperature
there and as a result the pressure and velocity of flow are highest. This
explains why the mineralized veins typically have an increasing aperture with
depth. The fact that the deposition of minerals occurs last of all close to the
intrusive means that the mineral content can be expected to be higher close to
the skarn. The residual fluids after the fractures are mineralized are cooked
over time and may result in the formation of massive mineral sulfide lenses.

In Velardeña there were several magma intrusives that were forced up from
below the earth’s crust. The first was in the San Mateo area and was not
associated with any mineralization. A plan view of these intrusives is shown in
Figure 2. The first intrusive is shown in blue shading.
The magma intrusive created fractures in the limestone and the contact zone
was cooked into metamorphic skarn rock but there were no dissolved metals in the
hydrothermal fluids at that time and so no mineralization occurred. The
intrusive is mainly diorite, a material similar to granite but with less quartz
content.
At a later stage there was a second phase of magmatic intrusion. These are
shown in green shading in Figure 2. Figure 3 shows a simplified representation
of the intrusives in the Santa Juana/ San Mateo area in a cross-section looking
NW (the section A-A indicated in Figure 2).

The second intrusive in the Santa Juana/ San Mateo area intruded through the
same weakness of the limestone formation as the first intrusive. This caused not
only fracturing of the intruded limestone, but also of the first intrusive
thereby creating conduits through which later mineralizing hydrothermal fluids
could circulate.
The second intrusive event was accompanied by mineralization. The circulation
of superheated aqueous, mineral rich, volatile fluids led to the transport and
deposition of minerals that can be seen in the Velardeña vein systems.

The geological phenomenon associated with intrusives suggests that if the
source of the mineralizing event can be located where the veins meet then there
is not only the possibility of very densely spaced veins of wide aperture and
rich grades but also the possibility of very mineral rich massive sulfide
lenses. Such a discovery would, by its nature, be a candidate for underground
bulk mining.
Over the last two years ECU has done an outstanding job of extending its
mineral inventory to 217 million silver equivalent ozs and up to 960 million
silver equivalent ozs of potential mineral have been identified. It should be
noted that ECU has been very conservative on their resource estimates and a
large portion of their “potential” category could be reclassified as “inferred”
with very little extra sampling. The impressive increase in mineral inventory
and potential minerals has, however, only been achieved by way of extensive
exploration and delineation of the vein system and only includes mineral
inventory up to 450m below level 18. The latest deep drilling extends 900m below
level 18, twice as deep as the current limit of resource estimates, so the
discovery of massive sulfides would dramatically INCREASE the current NI-43-101
resource estimate. The new drill results down to 900m below level 18 should also
allow a significant amount of “potential minerals” of the current NI-43-101,
(the portion located between 450m and 950m below level 18), to be re-classified
as “inferred mineral inventory”.
Looking to Make Contact!Let’s examine the latest press release of July2, 2008.
ECU stated:
QUOTE
The high number of mineralized veins encountered are consistent with the
geological model as they are within the marble/skarn alteration zone that
envelopes the intrusive event, which in turn sourced the vein mineralization of
the Santa Juana veins system. We believe the Calcite Veins are within an
alteration zone that surrounds a potential deep seated massive sulphide
replacement (Mantos-type) body. This is further supported by the presence of the
M-S Veins 48 metres (160 feet) below the Calcite Veins. Confirmation of assay
results for M-S Veins is pending.END
As one approaches the contact of the intrusive one would expect three
types of mineralization created through metamorphic alteration. First there are
densely spaced calcitic veins that are consistent with the limestone being
cracked by the intrusive and the cracks being filled with metal rich minerals.
Second there are cracks in the alteration zone filled with massive sulfides, and
then thirdly there are the massive sulfides formed at the intrusive contact.
From the press release we can see that the depth capability of the drilling
equipment was reached (900m) before reaching the contact of the intrusive. What
ECU is referring to as “Massive Sulfide Veins” could already be the start of a
massive sulfide lens because the first “vein” is almost 4m thick and drilling
ceased while in the second “vein”. This massive sulfide lens could easily be
tens of meters thick, and judging by the size of the intrusive could have
lateral extent in the hundreds of meter range.
What is extremely intriguing is that ECU released the assays for the calcitic
veins but did not release the results from the Massive Sulfide veins. They said
“
confirmation of assay results for M-S Veins is pending”. Note it is not
the assays that are pending but confirmation of them. I can think of only one
viable reason why assays would have to be “confirmed” and that is because they
are extraordinarily good! I titled my 2006 article “ECU Silver Mining - An
Extraordinary Junior Mining Company” and my interpretation of this press release
is that they may well live up to that billing by announcing some extraordinary
results. We will know very shortly.
When I wrote my article in October 2006 the silver price was $11/oz and ECU
had only 98 million ozs of silver equivalent of NI-43-101 compliant mineral
inventory comprised of:
- 17.4 million Indicated silver equivalent ozs.
- 81 million Inferred silver equivalent ozs.
The stock was trading at CDN$2.50. The company has now booked 217 million
silver equivalent ozs of NI-43-101 compliant of mineral inventory comprised
of:
- 37.6 million Measured & Indicated silver equivalent ozs.
- 179.0 million Inferred silver equivalent ozs.
The Company has also identified an additional mineral potential range of 549
million to 960 million silver equivalent ozs yet the stock is trading at $1.68!
Furthermore, the silver price is $18/oz. ECU stock is probably at least a factor
of 10x undervalued and should be trading at closer to $16 than $1.68. The fact
that ECU has been categorized as a thin vein mining play has unjustifiably held
down its valuation. The current deep drilling results could dramatically change
ECU’s prospects. The discovery of massive sulfides in a large lens with
extraordinarily rich grades could transform the company’s fortunes and the true
valuation of the company could be recognized by the market in explosive
fashion.Michel Roy, CEO and Chairman of ECU, is an extremely talented and experienced
exploration geologist. The geological model he defined has been proved correct
in press release after press release and by the astonishing growth of NI-43-101
compliant resources. The geological prowess of the ECU team is exemplified by an
outstanding discovery. In August last year the company announced they had
located the western extension of the Terneras Vein which had eluded all previous
exploratory efforts for over 100 years! Michel Roy’s team located it!
The ECU team has demonstrated they are world class explorationists and now
they have drilled a deep hole that has intercepted mineralization near the
intrusive that has long been postulated to be the biggest exploration jewel of
the Velardeña property. The assays of the calcitic veins show good grades and
increasing gold and silver content with depth. In respect of the Massive Sulfide
veins ECU is apparently needing to “confirm” the results. The track record of
ECU can only lead me to believe that this could be the most exciting news out of
the company yet.
Watch this company closely. It could, yet again, turn out to be
“extraordinary”!
ECU Silver Mining trades on the Toronto exchange under the symbol ECU.TO and
on the NASDAQ Pink Sheets as ECUXF.PK
Adrian Douglas
July, 2008
adouglas@marketforceanalysis.comFor full disclosure I am pleased to say that I am a long
standing share holder of ECU. This article has not been commissioned by ECU and
I have not, nor will I, receive any compensation for writing it. Mineral
exploration is a tough business with many risks involved; please factor your own
risk tolerance into any investment decisions.
_________________
SILVER is KING...Go GOLD...!!! 