41P11SE2037 2.23196 MACMURCHY010

Bennett VeinMacmurchy Township

Milling of a Gold Ore ForMaximum Recovery by Gravity

Separation

Date:

Prepared for: Prepared by:

22Aug2001

Pat RoskoMichael Nemcsok

fi Al Kon

Preface

This report investigates the use of gravity separation in the concentration of an

auriferous ore sample from Pat Rosko's claim number L1202 866. The intent is to gain

perspective on the use of gravity separation as a viable milling process on a production

scale. Mr. Rosko's goal is to determine the usability of his current milling equipment in

processing the ore available on this claim.

The success of gravity separation can also be associated with, or used to predict

the free gold content of the rock.

Michael Nemcsok,

tafcA^Mining Engineering Technician

Table of Contents

Table Of Contents l

Purpose 2

Background 2

Approach 2

Hypothesis 3

Equipment used 3

Procedure 3,4

Calculations 4

Discussion 4

Recommendations 5

Assay report sheets 6,7

Sample Source Property Location 8

Sample Source Location 9

Summary of Project Expenditures 10

Mining a Gold Ore for Maximum Recovery 22Aug2001Haileybury School of Mines Prepared by Michael Nemcsok A Al KonMilling fi Processing Research For Pat Rosko

Purpose

This report discusses the findings of the experimental laboratory investigation of a gold ore for maximum recovery using gravity concentration. A local prospector is assessing the viability of using a gravity circuit alone for processing of a gold ore from one of his properties.

Background

A gold ore sample from Pat Rosko's Bennet mine property was supplied for experimental mill trial for maximum recovery.

The gold ore was channel sampled from a 45 cm siliceous (quartz) vein woven with very fine chlorite and olivine strands. Country rock surrounding the vein is primarily mafic volcanic and was included in the channel sample across a proposed 1m working width.

Close observation of the sample pieces revealed some native gold in veins in the quartz, paralleling the chlorite veins. Euhedral iron pyrite crystals in the mafic volcanic wall rock were observed, but no pyrite could be found in the quartz vein material.

Approach

Preliminary assay results from TSL laboratories in Saskatoon, Saskatchewan suggested a fairly high grading gold ore of 36.25 g/t (1.279oz7t) gold, 10.3 g/t (0.363oz7t) silver. Visible coarse gold in the sample and a fairly high assay value prompted the use of gravity concentration for maximum recovery as per assignment directions. For a more meaningful report in consideration of Pat Rosko, a shaker table style concentrator was used, replicating the client's own milling equipment.

MiBing a Gold Ore for Maximum Recovery 22 Aug 2001Haileybury School of Mines Prepared by Michael Nemcsok A Al KonMilling A Processing Research For Pat Rosko

Hypothesis

Gravity concentration of the ore will yield fairly high recovery of gold from the sample under investigation.

Equipment UsedJaw CrusherCone crusherRifflerRolling PaperSpatulasBatch ball mills10 kg steel slug mill chargeRo-Tap machineSet of sieves down to 200 meshSteel pans for dryingSample drying ovenMass scale'Shaker Table' style concentratorBuckets, hose, fittings, etclOOOmL glass beaker for concentrate collection

Procedure1. The entire sample provided was crushed to 10007o passing 3/8", using a clean Jaw

crusher and cone crusher.

2. Coning and quartering of the initial sample yielded a l assay ton (approximate) sample that was sent for immediate assay for silver and gold by TSL laboratory in Saskatoon, Saskatchewan. A similar sample was submitted to PolyMet Resources Inc. in Cobalt, Ontario.

3. The remaining 4 kg sample was recombined then coned and quartered twice, providing two ~1 kg head samples.

4. Each l kg sample was ground dry in a batch bail mill for 5 hours until they were 8007o passing 200 mesh. Samples were then oven dried and weighed.

5. One of the two '1kg' samples was put in storage as a back up in case of complications with the concentration attempt.

6. The second 856g sample was mixed with water to form a slurry of approximately 20^0 water. This slurry was poured into the feeder of an adjusted and running shaker table, and a gravity concentrate was recovered.

Mffllng a Gold Ore for Maximum Recovery 22 Aug 2001Haileybury School of Mines Prepared by Michael Nemcsok A Al KonMilling & Processing Research For Pat Rosko

T! The middlings were tabled twice, and the resulting concentrate tabled three times. This repetitive tabling simulates the use of two roughers and three concentrating tables.

8. The concentrate was weighed at 0.87g (9.5e-7). The concentrate was a black sand with spectacular gold dust and small nuggets throughout. Magnetic behavior of the black sand indicates a high iron content.

9. The concentrate was weighed and brought to PolyMet labs in Cobalt for gold and silver assays.

Observations

See attached assay reports for assay values of head feed versus concentrate.

Calculations

Percent Recovery (gold) = gold content of concentrate l gold content of head feed

= (392.035ozA x 0.9568385e-6t) l (0.632oz7t x 0.0009435785t)= 0.6290757

— 63 % recovery gold

Percent ^Recovery (silver) = silver content of concentrate l silver content of head feed.

= (53.33 oz/t x 0.9568385e-6t) l (0.256 oz/t x .00094357851) ^ 0.2112653s 21 *Yo recovery silver

DiscussionThe gold recovery achieved was quite impressive for using shaker tables alone for

gravity concentration. This level of success can be attributed largely to careful sample preparation and suggests that the bulk of the gold in the ore is free gold in the quartz.

The silver recovery was not quite as good as we would have liked, this may suggest that the silver is tied up in the pyrite or otherwise bound with gangue. Perhaps other procedures beyond gravity separation alone may have yielded a higher recovery.

Mflllng a Gold Ore for Maximum Recovery 22Aug200]Haileybury School of Mines Prepared by Michael Nemcsok A Al KonMilling A Processing Research For Pat Rosko

RecommendationsWet grinding in cyanide solution could improve recovery beyond the levels

attained in this experiment. Cyanide would leach silver and gold from the grinding ore, freeing it from pyrite and enabling a more complete recovery of the precious metals.

It is possible perhaps that running the tailings through a knelson concentrator may also improve the efficiency of the milling circuit.

Yet another more practical solution might be to grind the ore to a finer consistency (80*Mi passing 300 mesh) thereby liberating the finer particles which might be lost to tailings. Assays of the tailings and further test milling experimentation will define the optimum grinding and separation circuit design.

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Subject : assaysDate: Wed,^Aug 2001^0:15:47-0400 ^ _^ ^

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Hi Mike, The assays from cobalt are attached. And from S'toon the numbers are: 36.25 g/t gold10.3 g/t silver.Al

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RESOURCES tNCS

PolyMet Resources Inc 1 Prestey Street Cobalt, Ontario

POJ 1CO Date

Lot No. 0-035

8/7701

Laboratory Report Sheet* 146 H.S.M.

.../getr

Sample NumberOapnane 4 Chad

#1 Head #1 K.C, Cone, in Float Feed

#1 Table Cone. #2 Head

K K.C. Cone. *2 Float Feed K Table Cone.

MUce&AJ Head A Cone. A

tisgYcurmbox^i

Ooid On/ton

0.216 1.104

OJ2 2.532 0.324 1.084 0244

1.44

0,632 392.035

)000000

Silver Ozfton

0.256 53.33

Jl&a^

Palladium Ozrton

2el544e.

Cirtfc

betaadc d6ay6c55tUb75d71 ifcms^M scjyy848ysi;722

Hotmail Folder: Inbox Page 2 of2

l l l l l lO

Yes NoFees Received

Except by special permission,reproduction of the*e results must

include any qualifying remarks made byPoiynwt Resources me

Notice: Attachments are automatically scanned for viruses using

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.../getmsgycurmbox=^UUUUUUUUl&a=Jeel544eJ3etaaddd6ay6c55tUb75d71&msg=MbCryy!i48y S/22/U1

J 1 (Jeep C'di'jj S* mf le ntcmis ' n\ opt* cu-f

SCALEmo /o

(feet)l,'B*h - 10

lo AUG BY-' n-

PAT

SAMPLE

Rosko Mining Inc.

Date

20-Oct-OO

23-Oct-OO

1-Nov-OO

24-Oct-OO

22-Aug-01

Type of work

Sampling

Test Milling

Test Milling

Fire assay of samples milled

Report Writing

Total Mileage (km)Rate (S/km)Travel Expenses

Total HoursAverage Hoi

Travel ExpeTotal MateriTotal LabouTotal Value

Workers

Michael Nemcsok

Michael Nemcsok

Michael Nemcsok

Michael Nemcsok

Michael Nemcsok

3000.390

3527

9017

701

m

Worker's Tasks

Rope work (Rappelling S sampling)

Sample Prep, Lab batch milling

Sample Prep, Lab batch millingDeliver samples to Polymet Labs

Researching, Report Writing

Details

Sample taken from old stope floor.

A gravity concentrate was prepared to investigate maximum recovery of free gold from sample: Calibrating batch mill setup at HSM.

A gravity concentrate was prepared to investigate maximum recovery of free gold from sample: batch mill run of sample at HSM.

Head and concentrate samples assayed

Compile results of experimentation into report for Pat Rosko.

Total Project Expenditure Value:

Man hours

3

4

4

2

8

Rate (S/n)

15

18

18

10

S BIG ,

Mileage (km)

300

0

0

0

Materials DescriptionSample Bags, Tags S Markers

Hose

Paper, Photocopies, Binding materials

ivlaieriais consumed (S)

2

10

5

Value S

45

72

72

20

500

Page 1 Bennet.xls

ONTMUO MINISTRY OF NORTHERN DEVELOPMENT AND MINES

Transaction No: W0280.00482

Recording Date: 2002-MAR-07

Approval Date: 2002-MAY-09

Work Report Summary

Status: APPROVED

Work Done from: 2000-OCT-20

to: 2001-AUG-22

Client(s):

189297

Survey Type(s):

ROSKO, PATRICK ARTHUR

METAL

Work Report Details:

Claim#

L 1202866

Perform Applied Assign ReservePerform Approve Applied Approve Assign Approve Reserve Approve Due Date

3816 3816 3816 ffo '"? "n "3816

3816 3816 3816 S816

30

30

O

30

30

30

30 2006-DEC-02

SO

External Credits:

Reserve:

SO

30 Reserve of Work Report*: W0280.00482

SO Total Remaining

Status of claim is based on information currently on record.

41P11SE2037 2.23196 MACMURCHY 900

2002-May-31 09:58 Armstrong-d Page 1 of 1

Ministry ofNorthern Developmentand Mines

Date: 2002-MAY-29

Ministere duDeveloppement du Nord et des Mines Ontario

GEOSCIENCE ASSESSMENT OFFICE 933 RAMSEY LAKE ROAD, 6th FLOOR SUDBURY, ONTARIO P3E 6B5

PATRICK ARTHUR ROSKO 158 BURNSIDE DRIVE KIRKLAND LAKE, ONTARIO P2N 1M7 CANADA

Tel: (888)415-9845 Fax:(877)670-1555

Dear Sir or Madam

Submission Number: 2.23196 Transaction Number(s): W0280.00482

Subject: Approval of Assessment Work

We have approved your Assessment Work Submission with the above noted Transaction Number(s). The attached Work Report Summary indicates the results of the approval.

At the discretion of the Ministry, the assessment work performed on the mining lands noted in this work report may be subject to inspection and/or investigation at any time.

If you have any question regarding this correspondence, please contact STEVEN BENETEAU by email at steve.beneteau@ndm.gov.on.ea or by phone at (705) 670-5855.

Yours Sincerely,

Sheila Lessard

Acting Senior Manager, Mining Lands Section

Cc: Resident Geologist

Patrick Arthur Rosko (Claim Holder)

Assessment File Library

Patrick Arthur Rosko (Assessment Office)

Visit our website at http://www.gov.on.ca/MNDM/LANDS/mlsmnpge.htm Page: 1 Correspondence 10:17006

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