So-Click on Feb 5, 1999 Progress Update- I say it still applies.
jaba.com
, 30 years of data has been compiled on JABA's
Hay Mountain project using a computer geographic information system (GIS)
data base. Those who follow JABA's news releases will remember that JABA
had a joint venture with Phelps Dodge on this project, however, Phelps
Dodge dropped out upon their corporate decision to drastically curtail
almost all exploration within the US and Canada. JABA retained all the
property and data generated on the project. Compilation of this data, as
well as new aeromagnetic data purchased by JABA indicates that older
aeromagnetic anomalies were mis-located, prompting the mis-targeting of all
subsequent work. JABA has found that: 1. There is a substantial aeromag
high approximately 3.5 miles long, probably representing a porphyry
copper-gold style intrusive at relatively shallow depth; 2. This hidden
body is surrounded by a distal, sub-micron gold halo, symmetrically
arranged around the magnetic high (values as high as approximately 1.5
ounces have been obtained from silicified zones at the surface in the
limestone host rock); 3. A circular structural anomaly is apparent on
rectified color photo mosaics surrounding both the mag high and the gold
zone (this appears to be a structural feature related to the intrusive
activity); and 4. Significant soil anomalies in gold, arsenic, and mercury
are also present in the distal zone. Jim Briscoe has prepared a
comprehensive Power Point slide presentation on the Hay Mountain project
encompassing the geologic, geochemical, and geophysical aspects of the
property. During the last week in January, in conjunction with the
Cambridge House Investment Conference and the Cordilleran Round Up in
Vancouver, Jim presented this information to a variety of major and
intermediate companies. The information was well received, and JABA expects
to be conducting field visits this spring.
The attitude of participants at the conferences in Vancouver was
optimistic. There were few that had not experienced a very grim 1998, but
there seemed to be signs of an upturn in the new year.
Presentations have also been made or are underway for our projects at: 1.
East Silver Bell where a new porphyry copper center with thick leached
capping indicating a potentially enriched chalcocite blanket at greater
depth was penetrated by 4 RC holes this summer; 2. Yardley where a mag low
1.3 miles long by 0.5 miles wide surrounded by four large mag highs - the
entire magnetic anomaly covering approximately 8 square miles - has been
defined. This signature suggests a porphyry copper center surrounded by
skarn. One RC hole has encountered copper-moly anomalous massive magnetite
skarn alteration, confirming that the source of the magnetic highs are
originating from skarn; 3. Tombstone-Walnut Creek where geochemical
patterns suggest a porphyry copper center with skarn copper, gold, silver,
zinc, lead replacement deposits; 4. Beatty, Nevada where a.) the Providence
Project forms the east wall of the Barrick Montgomery open pit now dormant,
and b.) the Tram Ridge property abuts Rayrock's Mother Lode mine property
and lies on the extension of the Mother Lode fault - vein; and 5. At
Randsburg, California where JABA claims abut the Glamis Gold Rand Project.
6. Apache, Arizona where Drs. Silberman & Armstrong have identified a
several kilometers long gold bearing quartz vein that appears to be the
feeder to previously mapped gold-bearing jasperoids. We will keep you
advised as news of developments occur.
Approximately 100 surface geochem samples have been taken over extensions
of mineralization at the Sullivan project. Metal anomalies have yet to be
interpreted. Negotiations with the underlying property owner to allow
additional metallurgical studies continue.
It is also heartening to note that Excellon, on whose Board of Directors
Dr. Guilbert and Jim Briscoe served until 1997, appears, with their partner
Apex Silver Mines, to have some positive developments on their Platosa
project in Durango State, Mexico. The silver-lead-zinc gold project which
is reported to be of substantial size, has been penetrated by four drill
holes and assays should be available shortly. Excellon stock has moved from
$.06 CDN to as high as $.71 CDN before falling back a bit to the low $.50
CDN range. This project lies 280 kilometers (170 ) miles south of JABA's
Niko project along the central Mexico limestone silver - base metal
replacement deposit trend. Congratulations to Excellon. JABA controls some
324,000 shares of Excellon Resources Inc.
JABA is pleased to announce that Dr. John Guilbert, Chairman of the Board,
will be receiving his prestigious Penrose Gold Medal (News Release November
13, 1998) on March 2 in Denver at the annual meeting of the Society of
Economic Geologists (SEG). In addition to the Penrose Medal, John has been
selected as SEG International Exchange Lecturer and will be speaking to
more than 20 international audiences comprised of professionals and
academics in Brazil, Argentina, Chile, Peru, and Ecuador during March and
April, focusing his lectures on porphyry copper deposit geology and
exploration, which will bring international attention to JABA and JABA's
portfolio of projects developed by John and Jim Briscoe.
JABA mt Guilbert is Chair of JBA...DOLOMITE is MVT mentioned above, a Sullivan Example:
dregs.org
The age and origin(s) of the Sherman-type Zn-Pb-Ag deposits have been controversial for over
one hundred years. Proposed genetic hypotheses for the Sherman-type deposits have invoked
processes that range from those involved in formation of Mississippi Valley-type (MVT)
deposits, occurring in Mississippian, Pennsylvanian, or early-Tertiary time, to mid-Tertiary
magmatic processes contemporaneous with formation of the Leadville-type deposits.
New petrographic and isotopic studies on dolomite cements that are associated with both deposit
types reveal five stages of host dolostone, and four generations of late dolomite cements (LDC).
These cements occur regionally throughout the Leadville Formation, or locally as gangue to ore
in both the Leadville- and Sherman-type deposits. Two generations of paragenetically early
regional LDC's and recrystallized dolostone display carbonate-staining, cathodoluminescence,
and carbon and oxygen isotope characteristics (19 to 25.2 d18O and -7.3 to 1.3 d13C) consistent
with formation by burial diagenetic processes during Pennsylvanian time. Two later generations
of ore-related cements exhibit distinctly different petrographic and isotopic characteristics (6.4 to
12.2 d18O and -6.0 to -1.6 d13C) and are clearly unrelated temporally, spatially, and genetically
to the regional LDCs. These newly recognized differences in cement paragenesis indicate
formation of the Sherman-type deposits after the Pennsylvanian burial event that produced the
regional LDC's. This constraint precludes the Mississippian-aged, syn-karst genetic hypothesis
for Sherman-type mineralization.
John M. Guilbert
Emeritus Professor, Department of Geosciences, University of Arizona
EXPLORATION TECHNIQUES FOR PORPHYRY COPPERS INTO THE 21st CENTURY
As the nature of the exploration business shifts more and more toward required discovery of
unexposed mineral deposits, and as exploration technology is increasingly able to adapt to that
reality, a whole new generation of techniques is coming into play that we all - field practitioners,
managers, and educators - need to deal with and understand. Many of the newly developed or
recently refined techniques also serve to optimize "bootleather" exploration as many of us have
practiced it, and discovery of partially or "cryptically" exposed orebodies will also be aided by
these novel methodologies. Some of the "new tricks" and extensions of old ones represent
dramatic developments and improvements that have already changed (or will soon have
changed) the way we carry out field work and discover new deposits and resources.
Novel approaches, the applications of which will be described and integrated include Global
Positioning Systems (GPS, Omnistar, etc.), computer uses (GPS-GIS, AutoCad, image
processing, field and derivative data management), the Total Station concept (VectorMap,
PenMap, ArcView) and its uses, the several new portable instruments for field mineralogical and
chemical analysis (PIMA-II, MapTool, and LIBS), some new geophysical techniques
(Hyperspectral TM, TEM, CSAMT, etc.), novel geochemical systems that are effective for
buried deposits (Mobile Metal Ion, Enzyme Leach, electrogeochem, and multielement analysis
and data management) and isotope systems (Cl, Re-Os, Nd-Sm), and Quantitative Alteration
Mapping. Many of these approaches will take us to places we have never been before in
exploration - we enter the New Century and the New Millennium with formidable challenges,
exciting developments, and expanding capabilities for mineral deposit discovery.
..>> Dolomite part scaned as an aside as NOT part of Dr John Guilberts' presentaion....also not Mobile Metals Ions that is mention, refer to Maxam Gold Thread for their use of the Tech by Hydrogeophysics of Tucson, AX- Just down the road a piece, South.
Chucka
MMI TECH:
hydrogeophysics.com
Sample and Examples:
hydrogeophysics.com |
