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Richard Mieritz Mining Collection
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CONTACT INFORMATION Mining Records Curator
Arizona Geological Survey 416 W. Congress St., Suite 100
Tucson, Arizona 85701 520-770-3500
http://www.azgs.az.gov [email protected]
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t\ PRQ~RESS REPORT ON COfPER LAKE IS ~J.l'.:MENTlr-..'E PROPERTY, MARICOPA CO., AZ. SU.MMARIZH~ CALCULATED MINEABLE GOLQ
RESERVES
By
l;t:raId Wea t hers
TARLE CF CONTEt-.rrS
Page No.
1 :':'"'['RODUCTI ON ••• (I, •• n ..... (I (I ~ • 0 • /I' (I ~ " ••• 1(1 • Q III & •• flO ............... & ....... . 1
L~r~ OLl(; Ie CONCEP'IS!t f10 {, 0 •• 110 • It 0 ~ ('0 ....... ., •• \) 1(1 co d ('> 0 !II ............... ,. .. II' 0 .. ... . 1
RESERVES DEVELOPED AS A RESULT OF' FORMER DRILL PR(X;RAN5 •••••••• 2
CURRENT DRILL PROGRAt'1 •.••.• , ••••.••••••••••••••••••••••••••.••• 3
CURRENf GOLD RESERVES ., •. , ••••••• , . •••.••••••• . ••••••••• •• , • , •••• 3
C Cl'1MENTS .......... It " 0 ..... 00 () fI 0 n •• ('I I) (l § ~ .. " .... t;, ... 0 ,. • Q ....... It 110 • CI 0 •••• ,. ... .. 4
l<ECCJ.t1'-1ENDA'fIONS ... n 1(1 0 .. ,. ... (l ... 011 ... I'l ...... .. ......... o ......... ., ., ......... .. 5
ILLUSTRA TIONS
EXHIBIT NO. 1 - REVISED MINEABLE RESERVES PREPARED BY M. J . BRUDER Attached
EXHIBIT NO. 2 - REPORT ON CLEMENTINE ORE RESERVES, MARICOPA COUNTY, ARIZONA BY
FIG.
FIG.
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III
SECTION " " " "
Mo J 0 BRUDER 11/30/81
CLEMENTINE GOLD PROPERlY MAP 1" = 40'
CLEMENTINE PROPERTY MAP 1" = 2,000 t
A-A' B-B' C-C' D-D' E-£'
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A ttaclted
Attached
Attached
GEREX, INC. MINERAL EXPLORATION
j', ):.1 ()t!I~t' Box H26
1:1'\1 M( i l1lt'/lll 11 3, AZ. 86342
A PR(x;RESS REPORT ON COPPE[.t LA.Ja:' 5
CLEMENTINE PROPERTY, MARICOPA COtJF!Y. ARIZO~
SliMNARIZING ~CULATED MINEABLE
GOLD RESERVES
January 1982
By
Gerald Weathers
INTRODUCTION
Telephone
(6fl~) 5(,,7-4779
The wri ter has been associated wi th the development of the Clementine
JlJ 'uperty since 1961. During this time the gold reserves have by means of I
:l l:lermittent drilling programs been consistently expanded from the gold
r'lJ.neralization occurring in a shallow shaft and numerous scattered prospect
pJ ts to the tonnages and grades outlined in this report, and also delineated
Ull the enclosed maps.
GEOLOOIC CONCEPTS
Gold mineralization was observed to occur principally Within a north
,' ;tsterly trending-southeasterly dipping structure stained by red hematite
dlld containing white subparallel to ramifying quartz veins; presenting a
slt ~ lrp contrast to the surrounding dark gray pre-Cambrian Yavapai schist host
.:-l)ck.
Exposures of this structure were sampled along its northeasterly trend
,'" r upproximatel.> a mile where it is covered by younger volcanic flows.
(}\{'f er to Map, Fig. Ill). Sample assays revealed the greatest surface
'': Ilncentration of gold to occur at the intersection of the quartz-hemati te
-.; . ructure with a northwesterly trending, southwesterly dipping mar.ganiferous
.' . \ lei t (' st ructure, forming an ore shoot.
The majority of the g~ld with1Q;i::' ~_$e iute~~ecting structures was found
found to be submicrospopi~;~, in size and thus invisible when searched for through
the usual field lenses, p~i!Lcing hea~ reliance on sample assays for explor:J.tion
guidance.
Subsequently, this ore shoot has been mined by open pit me thods and f 0] lowe,
for 700 feet downdip by drilling, toward the south. The continuously mineralize·
zone is interpreted via these methods to be at least. 700' wide and to dip to the
'..;outh and rake to the east resulting in an apparent 30 degree dip to t.he southea
Pending drill hole sample assays and future drilling programs should expand t.he
volume of known gold reserves ~thin this zone. (Refer to Property Map, Fig. III
and Plan Map, Fig. I, plus sections).
Additional intersecting structures mineralized with gold have been observed
along the principal structure, but remain unexplored at depth. (Refer to Map,
fig. III).
Recent brief studies by independent and company geologists have disclosed
additional structures radiating from the open pit area and also other apparently
unrelated (1) mineralized structures, particularly to the south of the present
development. (Refer to Fig. III).
RESERVES DEVELOPED A5 A RESULT OF FORMER DRILL PR(x;RAMS
1973
4,228 feet of shallow percussion holes were drilled along the strike of th(
rfia in structure ending in July, 1973. As a result of this program, tlcu1ated
TIl8asur<:.d reserves were 112,500 tons averaging .06 oz. gold/ton and 0.3 oz. silVt r
Lon. Indicated gold reserves were estimated to be 594,700 tons and inferred
reserves 5,000,000 tons.
1981
Seventy-nine 4tfl diameter percussion holes totalling 9,025 feet were dri 11, l
~ !l 50' intervals along the strike and in the present pit area beginning Dec. 19H
<tnd ending April 1981.
- 2-
Mr. Brian Bond, a Geological Engineer, was employed to on site supervise
I' ~ last portion of this program. In his May 1981 report, Mr. Bond, calculated:
Proven Reserves 329,352 tons grading .06 OZ~ gold/ton.
Probable Reserves - 538,627 tons grading .06 oz. gold/ton.
Possible Reserves - 2,338,008 tons.
These near surface reserves were calculated from data received from blast
ie, bulk, channel and drill hole sample assays.
Samples were assayed by a registered Assayer, Who installed an Atomic
! ::>orption Spectophotometer in a laboratory constructed on the property. Assays
J check samples were obtained from independent assay laboratories, who used both
I :)mic absorption and fire assay methods. Mr. Bond calculated the average devia-
, .on between the two methods to be .01 oz/ton.
During this drilling program, 84,319 tons of material were open pit mined,
~ Lng scraper loaders, and dumped on a leach pad. Representative bulk samples
I J)m each load dumped were consolidated, prepared as composite samples and sub
I ! j t ted to Mountain States Engineering for assaying and feaaihili ty tests. The
I : i iled material averaged .05 oz. gold/ton.
CURRENT DRILL PR(x;RAM
25,825 feet of 5 inch diameter percussion holes were drilled starting with
I~ 80 in August 1981 and ending with CR 169 in the latter part of December 1981.
II- ' drill hole locations are shown on Fig. I - Gold Interval Intercepts; grade
: r- I hal e depths are shown on the enclosed tables and sections.
CURRENT GOLD RESERVES
Mr. M. J. Bruder, a Mining Engineer, was employed to supervise the balance
)f the drill program, to calculate gold reserves, and to propose the plan for an
I i,- ·m pi t mining operation designed to mine the proven mineable reserves.
Based on the information developed to date,Mr,. Bruder has calculated the
Ii teable proven gold reserves to be 737,063 tons averaging .051 oz. gold per ton
.' i l.h a stripping ration of 1.4: 1 (Refer to .Exhibit No.1 and Fig. I).
- 3 -
In addition to the above reserves, 84,319 tons of material averaging .05
oz. gold per ton has been placed on the leach pad, and muck selectively removed
from the open pit using an end loader has been stockpiled as follows:
Total
Est. Tons
50,9°0 10,4.00 20,000
80,000
Est. Grade (Assays
.07, oz. Au/T
.03 oz. Au/T _ 047 oz .Au/r
.06 oz. Au/T
Pending) ~5,J)iJ,
"'-~O()
~ 5') ,/7 If (> ~ Otp 0-[
Thus, the proven mineable, plus stockpiled gold reserves are presently
judged to be 901,382 tons averaging .052 oz.; gold/ton.
It is expected that pending assays of sampled drill hole intervals multi
plied by their calculated areas of influence will result in mineable proven
gold reserves in excess of 1 million tons.
Assay comparisons of check samples sent to independent assayers are tabu
lated in Bruder's report, Exhibit 2).
Bruder has estimated probable gold reserves to be 5.52 million tons
grading 0.055 oz. gold/ton and possible reserves to be 17.7 million tons
grading .05 oz. Au/Ton, based on a study of the available data and the
occurrence of favorable geologic structures.
COMMENTS
A large percentage of Bruder's mineable gold reserve polygon areas and
calculations were closely checked and found to be reliable.
Ibe proven reserves in the areas adjacent to the mineable reserves will
have to be expanded or shown to continue into the mineable reserves by future
development exploration before they can be seriously considered for mining.
Geologic investigations have been confined to a northeasterly trending
structure and principally to the intersecting structure in the open pit area.
It is expected that future geologic work will reveal the occurrence of a
mineralized structural pattern along these and other structures.
- 4 -
There is no drill hole information below 300 feet on the down dip
projection of the known ore shoot; however, it is reported (news release)
that Ranchers' Exploration, who have recently drilled around the Gunbolt
Prospect immediately to the east (Fig. III), have encountered high grade
drill hole intercepts near the 800 foot depth.
There is no known subsurface geologic information available pertaining
to the areas overlain by alluvium or by younger volcanic flows. (Fig. III)
Based upon the above enumerated observations as well as the fact that
the explored portion of thisproper~ is confined to a 20 acre tract encom
passed by about 2 ,~OOacres within the property boWldary, it is apparent
that only a small fraction of the underlying gold bearing potential of this
property has been' explored.
RECOfMEl!PATIONS
It is recommended that the base map b~ing prepared for this property be
completed.
The geologic field investigations should continue and results obtained
plotted on the base map.
Information derived from the drilling program should be evaluated and
another drilling program planned designed to expand the proven gold reserves.
J anl.1aIY 1, 1982
.1 ~
- 5 -
Gerald Weathers Gerex, Inc.
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R~ORT ON
CLEMEN1'~KE ORE RESERVES
MARICOPA COUNTY, ARIZONA
by
Michael J. Bruder
11/13/81
. i ~ .,
pHIBIT HOe . 2
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PAGE
1
2-3
1-9
10-11
12-14
Table of Contents
Ore reserves
Methods of calculations
Appendix
Ore reserve calculations
Independent assay comparisons
Independent assay certificates
RESULTS
As of November 11, 1981 1,002,94) tons of ore with an average grade of .054 oz/ton Gold have been proven. Proven reserves are measured directly from drill hole assays and no information is interpreted more than ioo feet in any direction.
Probable (indi cated) reserves are 5.52 million tons at .055 oz/ton average grade. Probable reserves are estimated using surface samples as a guide to the extent of the ore and the average thickness ,(42 feet ) from previous drilling.
Possible (inferred) reserves are 17.7 million tons
at .055 oz/ton average grade. Inferred reserves are determined by locating favorable geologic structures and est imating grade and thickness.
-~
METHODS
Drilling on the Clementine Property is being performed
by Venture Drilling Company of Tucson, Arizona. A CP 650-W9 percussion drill rig with an a~tached cyclone sampling system is recovering 10 pound samples every five feet. These samples are split. bagged and marked at the drill site. When the samples arrive at the bucking room they are split into J separate samples. One sample is pulverised and sent to the lab for assaying, the second goes to the Geologist for mineralogical identification and the third
is stored for future reference. Periodically parts of the third sample are sent eo other assay labs in the area as a check. The results of these independent assays can be found in the appendix on pages 12-14.
Assaying is being done in a mine site laboratory by Fred C. copeland, a certified assayer, and two assistants. The Gold is chemically extracted from 5 gram samples and the concentration is determined using a Varian AA-275 Atomic Absorption Spectrophotometer. The results are recorded in the lab and the Geology/Mining department.
Ore reserves are calculated using a polygonal approach. Most development drilling is on 50 foot centers while exploration drilling is on 100 foot centers. The area of influence of each hole, as determined from the polygons, is multiplied by the number of 5 foot intervals greater than .020 oz/ton to determine volume. The volume of each
hole is multiplied by the average grade of that hole to determine a volume-assay product. The sum of all the volume-assay products is divided by the sum of all the
. volumes to determine an average grade. Tonnage is calculated
by dividing the total volume(in cubic feet) by 27 then
2
multiplying by 2.) tons/cubic yard. The figure of 2.)
tons/cubic yard is taken from a book by Milton B. Dobrin
entitled MIntroduction to Geophyiical Prospecting" and is
for a schist with little mineralization. (Most overburden
is Precambrian Yavapi Schist.) The density of the Clementine
ore will be slightly greater than 2.) tons/cubic yard due
to the presence of Manganese and Hemitite, both of which
are more dense than the schist. Ore reserve, tonnage will
increase with the completion of density studies now planned.
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. . ,Arizona Te$ting Laporatorles
817 West Madison . PhoenilC, Arizona 86001 Telephon;264·6181
For Copper Lake Exploration Post Office Box 2001
Date Septel1ber 9, 1981
Sun City. Arizona 85372
ASSAY CERTIFICATE
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GO 1.0 SII.VER COPPER
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Date September 9. 1981
ASSAY CERTIFICATE c,
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REPLY TO,
2940 N . CASA TOMAS PHOENIX, ARIZONA 85016 TELEPHONE 1602) 277-6053
~itll'trd ~. (1}Nieritl MINING CONSULTANT
GEOLOGY EXPLORATION
EVALUATION FEASISI LlTY OPERATION
ARIZONA REGISTERED MINING ENGINEER AND GEOLOGIST
Mr. Daryl Buerge~ Managing Director Copper Lakes Mining Company P. O. Box 2001 Sun City, Arizona. 85372
By-verbal request of and authorization by Daryl Buerge, Managing Director of Copper Lakes Mining Company, Sun City. Ar'izQua, the WJ;'iter has reviewed and studied certain factual data pertaining to the Clementine gold property. Maricopa County, Arizona.
The factual data presented to and reviewed/studied by the writer included the following:
(1) A Progress Report on the Clementine gold property dated January 1. 1982 by Gerald Weathers,
(2) Report on Clementine Ore Reserves~ dated November 13, 1981. by Michael J. Bruder, mi~ing engineer for Copper Lakes,
(3) A Drill Hole Plan Map, M. J. Bruder, (4) An Ore Reserve Block Plan Map. M. J. Bruder. and (5) Sections A-A'. B-B'. C-C', D-D'. E-E'. F-F' and G-G' in
various directions through a majority of the holes drilled. M. J. Bruder.
What was not provided were assay results of individual five foot samples from the drill holes -- only averages for the intersected mineralized zone/zones in the various drill holes.
ORE RESERVES: General
The polygonal method of tonnage calculations as used by Mr. Bruder is an acceptable means. He has determined the volume of each block, applied an average grade of mineralization as determined by individual drill hole samples and weighted each block by multiplying the grade by the respective volume, adding these products and dividing by the accumulated volume of the blocks of concern.
Lack of an adequate, complete set of vertical Sections through the many drill holes in both directions leaves something to be desired as to the "choice" of t:he method used. The writer's interpretation of the "ore body" shape on 3 or 4 of the rather unreadable Sections given him, indicate a "fingering" of values from hole to hole, and thus, some inclusions of waste are present which have not been accounted for. The end result being a lower tonnage figure and suggests a different method of calculation.
Mineable Reserve:
The great number of holes drilled and the rather close grid spacing of such holes certainly suggests that a "proven" classification of mineralization is the right choice.
The writer has "spot checked" Mr. Bruder's calculations and found them to be correct. No large significant error was found.
The cubic foot per ton conversion factor used by Mr. Bruder--as he so states in his report--is in question and could be revised after tests on this characteristic have been resolved. The writer has used 12 cubic feet to the ton. As a result, the writers tonnage figures are slightly lower -- by comparison:
Bruder Hieritz
Geologic Reserve:
TONS 764,070 747,460
GRADE 0.052 oz Au/ton 0.052 oz Au/ton
A review and study of the "Proven Geologic Reserves" - Bruder, pages 1 through 7, indicates this total figure of 1,136,022 tons as of April 13, 1982, also includes the proven "Mineable Reserves" of 764,070 tons. The writer's Total figure for this category is 1,111,325 tons -- againusing a 12 cubic foot factor.
By review and comparison of hole mineralization intercept lengths and grades, the writer finds differences in the length and grade figures. This is fine as long as the lengths used in the "mineable" reserve are LESS than the length for the same hole in the "Geologic Reserve" category. In several instances this is not true. Examples, holes CR-69, 105, 108, 121, 132, 135, 153 and 154. No doubt there is a plausible answer, but it is not readily apparent to the writer from the information in hand. A lower "mineable" tonnage figure exists if the longer lengths were reduced to the lengths for the same holes in the "Geologic" tonnage.
Probable-Possible Reserves:
The writer can not comment either positive or negatively on Mr. Bruder's figures of 5.5 million tons and 17.7 million tons respectively for the probable-possible reserves.
The writer was on the property many years ago in the company of Mr. Gerald Weathers and is thus knowledgeable of same but not sufficiently so to form an opinion for this large area of mineralization even though the general area is recalled.
SA}1fLING and ASSAYING:
Accurate sampling proceedures and accurate assaying methods and results
2
are a MUST. Constant checking is required.
Percussion drill is not necessarily the best drilling but is usually used as dictated by economics. The collected samples are subject to many fallacies--loss of air circulation, loss of sample, dilution, salting, etc.
A 4~ inch diameter drill bit will drill a hole slightly larger in diameter, however, for a five foot run it will cut a total sample of approximately 92 pounds of material using 12 cubic feet to the ton and if the sample recovery is 100%. Sample recovery can range from zero to in excess of 100%. If more than 100%, either salting or dilution has occurred.
Mr. Bruder indicates in his Report that of each sample received at the drill rig, 10 pounds of the material was collected for the true sample for assaying, mineralogical study and storage. The total sample received at the drill rig was not mixed prior to taking the 10 pound sample. The remainder of the sample at the drill site was discarded. Mr. Bruder explained that this "reject" of each sample was never "check assayed". Although some mixing of the cuttings occur in the cyclone collection system, layering still occurs in the collection bag. Actually, the collected sample should be "rolled or hand mixed" prior to removing the 10 pounds for the above mentioned uses. The large sample should be reduced by splitting at the rig. Moreover, occasional samples of the rejects should have been assayed for a check as to being representatively mixed or uniform. This assurance is of particular importance with "low grade ll --"high dol-lar value" marginal ores where 0.005 oz./ton of gold could mean .the difference between a profit or loss.
The "check assaying" of samples as shown on page 10 of Bruder's Report is good --where results are in thousands of . an ounce. An analysis of the tabulated comparison indicates the independent assayer was slightly higher for 6 samples than Copper Lake in a range from 0.001 to 0.049. In contrast, Copper Lake was moderately higher than the independent as sayer for 7 samples in a range from 0.006 to 0.137.
The average of the 13 samples for Copper Lake was 0.149 and 0.130 for the independent assayer. The difference is 0.019 oz/ton, or 12.75% higher if the Copper Lake average is used as a base--or--14.61% higher if the independent assayer's average is used as a base.
This analysis indicates poor sample mixing and/or poor assaying. The writer is of the opinion that it would be more inadequate mixing and erratic distribution of the mineralization which in turn reflects on the mixing of the sample.
The assay comparison on page 11 of Bruders Report both average out to 0.0110z./ton, however, comparing individual sample assays, there is considerable difference, again pointing to inadequate mixing and/ or erratic distribution of the mineralization.
-- 3 --
MINING COSTS:
Mr. Bruder provided the writer a summarized cost sheet for equipment operation as prepared by the equipment engineer. The shown cost of $1.10 for 2 trucks, 1 loader, 1 tractor and 1 water truck, which the writer assumes and includes operator, ·fuel, oil, maintenance, repair labor. parts replacement cost, down time, depreciation, interest on investment money, etc. Without a dollar and cents break-down of the costs, the writer can not opine seriously, but it is :,thoughtthat the cost is low.
Mr. Bruder stated the drilling and blasting costs would bring the total mining-blasting-transport cost to $2.00/ton--ore or waste. The writer opines this figure is approximately 25% low.
MILLING--GOLD RECOVERY:
It is understood that "heap" leaching and zinc recovery of the values will be utilized. It is also understood that grinding of the ore to 65 mesh is necessary. The writer is not an enthusiast for "heap" leaching for high recovery rates and therefor desires to withhold an opinion in this regard.
OVERALL COMMENTS:
Bruder's "Mineable Ore Reserve" is satisfactory as an initial metalliferous volume, but the writer opines more detail and refinements are required.
Considerable differences occur in the check assay routine which in the mind of the writer raises some doubt as to the projected grade of the metalliferous deposit. This condition is very serious, par~ ticularly since -- at this time of gold prices -- the deposit is so close to being marginal economically.
Although not previously discussed, but reviewed section-wise, as far as the information at h?nd is concerned. it appears that an overall ore to waste ratio will p~obably be 1 :: 2+, rather than the 1 :: 1.4, primarily because of the anticipated wast inclusions in some of the "are blocks". This condition requires more detail and refinement.
The writer opines the mining-breaking-transpo'rting costs are low. A more detailed study should be made in this direction.
4
TO: Copper Lakes Mining Company P. O. Box 2001 Sun City, Arizona, 85372
INVOICE
For Professional Services Rendered in Connection with n review and study of the Clementine Cold property, ~~ricopa County, Arizona. as requested and authorized by Mr. Daryl Buerge. Mc'lIlaging
Direc~Lirector of Copper Lakes Hining Co.
1 Day @ $300.00/dny 5 lirs @ $40.00/hour
TOTAL FEE mi'E
Tillle SEent April 16, 2 hours April 17. 2 hours April 18, 3 hours April 19, 6 hburs,
Review, f1
" Study.
study, calculations t l .. " (; n ..
Report preparation
Amount due is payable upon receipt of Invoice.
Please remit to R. E. Mieritz at above address.
April 19. 1982
$ 300.00 $ 200.00
$ 500.00
TO: Copper Lakes Mining Company P. O. Box 2001 Sun City, Arizona, 85372
INVOICE
For Professional Services Rendered in connection with a review and study of the Clementine Gold property, ~~ricopa County, Arizona, as requested and authorized by Mr. Daryl Buerge, Managing
Direcl)cirector of Copper Lakes Hining Co.
1 Day @ $300.00/day 5 Ers @ $40.00/hour
TOTAL FEE DtJE
Time SEent
April 19, 1982
$ 300.00 $ 200.00
$ 500.00
April 16. 2 hours Review. study, calculations April 17, 2 hours II II II .. April 18, 3 hours " Il n II
April 19, 6 hburs. Study, Report preparation
Amount due is payable upon receipt of Invoice.
Please remit to R. E. Mieritz at above address.