New AMT SURV OPERATIONAL RPT ERMATINGER CASCADEN & … · 2017. 1. 17. · In this coordinate...

Wallbridge Mining Company Ltd. Armstrong-Ministic AMT Survey

"RECEIVEDJUN 20 2001

GEOSCIENCE ASSESSMENT OFFICE

GEOSYSTEM

AMT SURVEY,ARMSTRONG - MINISTIC LAKE,

ERMATINGER, CASCADEN and TRILLTOWNSHIPS, ONTARIO.

OPERATIONAL REPORT

Volume 1/1

2.21934prepared for

WALLBRIDGE MINING COMPANY LIMITED

byGEOSYSTEM CANADA INC.

Ottawa, Ontario.

June 2001

41I12SE2005 2.21634 CASCADEN 010

Wallbridge Mining Company Ltd. Armstrong-Ministic AMT Survey

CONTENTS1. INTRODUCTION...........................................................................................................l

1.1 SURVEY DESIGN..................................................................................................................l1.2 DATA ACQUISITION............................................................................................................21.3 REMOTE REFERENCE...........................................................................................................3

2. DATA PROCESSING AND EDITING...........................................................................32.1 PROCESSING OVERVIEW......................................................................................................32.2 ROBUST PROCESSING..........................................................................................................3

3. DATA PRESENTATION ................................................................................................43.1 DATA DESCRIPTION AND DIMENSIONALITY...........................................................................43.2 PHASE MAPS.......................................................................................................................4

4. BIBLIOGRAPHY ...........................................................................................................4

Figures

Figure la: Ministic Lake station locations. Coordinates are in meters on the UTM grid (NAD 27)......!Figure l b: Armstrong Lake station locations. Coordinates are in meters on the UTM grid (NAD 27). 2 Figure 2: Sounding 61e70n, located in the central portion of Ministic Lake........................................4

I: Phase maps of Field Data II: Personnel and equipment

II-1: Personnel II-2: Equipment II-3: Data Format

HI: Station Coordinates

Appendices

PlatesPlate l: Station and profile locations, scale l :20,000.

41I12SE2005 2 .21634 CASCADEN 010C

Report prepared by:

y. McNeice, M.Sc. Senior Geophysicist

Wallbridge Mining Company Ltd. Armstrong - Ministic AMT Survey

SUMMARY

One hundred and twelve audio-magnetotelluric (AMT) measurements were collected in Ermatinger, Cascaden and Trill Townships, Ontario at an average spacing of 200m along 12 north-south oriented lines, spaced 300m apart. AMT data in the frequency range 5.0-20,000 Hz, were acquired between January 7 and 16, 2001, using three 5-channel Metronix 24 bit ADU-06 acquisition systems. One system was a fixed reference station in a culturally quiet location, while the other two systems were used within the prospect area. Each AMT measurement consisted of a perpendicular pair of 50m dipoles, two orthogonal magnetic field sensors, and one vertical magnetic field sensor. Robust processing resulted in generally average data quality within the survey area. The AMT data were edited and rotated to a regional coordinate system determined through swift decomposition. The results are shown as a series of phase maps, the impedance phase at single frequency contoured as a function of grid position.


1. INTRODUCTIONThis report describes acquisition and processing procedures of an audio-frequency magnetotelluric (AMT) survey conducted in Ermatinger, Cascaden and Trill Townships, on behalf of Wallbridge Mining Company Ltd. A total of 112 AMT stations were occupied along 12 north-south oriented profiles. Station coordinates are listed in Appendix HI.

LI Survey design

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Figure la: Ministic Lake station locations. Coordinates are in meters on the UTM grid (NAD 27).


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457000 458000 459000Figure Ib: Armstrong Lake station locations. Coordinates are in meters on the UTM grid (NAD27).

The survey was carried out using three 24-bit ADU-06 systems manufactured by Metronix GmbH of Braunschweig, Germany. Magnetic sensors were the BF-6 induction coils produced by Electro-Magnetic Instruments Inc. (EMI) of El Cerrito, California. Appendix n contains a description of the personnel and equipment used for the survey, along with a description of the data formats.Layout followed the normal MT axis convention, that is, a right-handed system with z positive downwards. Dipole lengths of 50 meters and a fixed acquisition azimuth of geographic north was used throughout the survey. Access to the grid was by 4WD vehicle as far as possible, and then on snowmobile. Due to the low system weight, the operator and l or 2 helpers were able to pack all of the necessary gear without difficulty.

L 2 Data AcquisitionThe time series data were acquired in 2 sample bands. The highest sample rate used was 40960 Hz for duration of 7 seconds. A 2048 Hz sample band was recorded for 7 minutes. The 2048 Hz sample band was decimated to a sample rate of 128 Hz to compute the low frequency data.


1.3 Remote ReferenceA remote reference site was maintained along the Fox Lake lodge road in Ermatinger Township.

2. DATA PROCESSING AND EDITING

2.1 Processing overviewThe basic steps required to transform field time-series to usable data are as follows:

1. Automatic selection of coherent data segments (low noise) by comparison of the electric and magnetic fields in each band (40960, 2048, and 128 Hz);

2. Robust processing of the 300 most coherent data segments in each sample band;3. Merging of individual bands (3) to form a complete sounding curve;4. Checking of calculated curves for geophysical plausibility.

Data were archived on CD ROM on a daily basis after the time series was transferred from the field computers to the processing computer. Time series were viewed with the Metronix visualization program QuickLook. Automatic coherency selection and robust processing were carried out using routines developed by Jim Larsen (Larsen and others, 1996). Data analysis, interpretation, and presentation were completed with Geosystem's interpretation software, WinGLink.

2.2 Robust processingRobust processing techniques were employed to improve data quality and reduce the effects of noise bias. The method of Larsen and others (1996) was used to estimate smooth magnetotelluric transfer functions (i.e. impedances) relating the electric and magnetic field data.Data segments were automatically selected on the basis of electric and magnetic field coherency, and used as input to the robust processing algorithm. The magnetic and electric fields are used in an iterative re-weighted method to determine the impedance tensor. During the iterations, the electric fields are corrected in both the frequency and time domains, utilizing a smooth MT transfer function to estimate the electric field data from the magnetic fields. The total time required to robust process a single sounding was approximately 15 minutes.The program outputs data at 8 equi-spaced frequencies per decade (e.g. 10, 15, 22, 32, 42, 48,62, and 82 Hz). All of the soundings were processed using the robust algorithm.


3. DATA PRESENTATION

3.1 Data description and dimensionalityThe AMT responses are primarily two-dimensional over the acquired frequency band. Data were rotated to ~150 (average strike 0-30 degrees) decomposinging the data into responses parallel and perpendicular to regional strike (the TE and TM modes respectively). In this coordinate system the TE mode appears to be the Ryx curve, electric field approximately perpendicular to SIC structure. An example of this is shown in figure 2 (Ryx ~ TE, Rxy = TM).

10.

i

0-

10'' 10'2 10"

Period (sec)

Figure 2: Sounding 61e70n, located in the central portion of Ministic lake The blue apparent resistivity curve is identified as the TE mode and red as the TM mode.

3.2 Phase mapsPhase maps of observed impedance phase at frequencies 100 and 30 Hz are plotted in Appendix I.

4. BIBLIOGRAPHYLarsen, J., Mackie, R.L., Manzella, A,, Fordelisi, A, and Rieven, S.

Wight, D.E.

1996 Robust smooth magnetotelluric transfer functions: Geophys. J. Int. 124, 801-919.

1988 SEG MT/EMAP Data Interchange Standard, Revision 1.0: SEG, Oklahoma City. 91pp.


APPENDIX I: PHASE MAPS OF FIELD DATA

ONTARIO MINISTRY OF NORTHERN DEVELOPMENT AND MINESTransaction No:

Recording Date:

Approval Date:

Client(s):

392385

Survey Type(s):

W0170.30334

2001-JUN-20

2001-AUG-13

Work Report Summary

Status: APPROVEDWork Done from: 2001 -JAN-07

to: 2001-JUN-19

WALLBRIDGE MINING COMPANY LIMITED

EM

Work Report Details:

Claim*

SSSS

SSS

S

SS

1229362

1229363

1229501

1229502

1229503

1230737

1244716

1244717

1244718

1244719

Perform36,475

37,771

SO

54,316

SO

S863

53,454

S7.771

510,361

57,339

548,350

External Credits:

Perform Approve

56,475

57,771

SO

54,316

SO

5863

S3.454

S7.771

510,361

57,339

548,350

SO

Applied

soso

S2.000

54,400

S4.000

SO

SO

SO

SO

50

510,400

Applied Approve

soso

52,000

54,400

S4.000

SO

sosososo

S10.400

Assignso

52,000

5050sososo

54,000

584

SO

56,084

Assign Approve

02,000

0

0

0

0

0

4,000

84

0

56,084

Reserve56,475

55,771

SO

SO

SO

5863

53,454

S3.771

510,277

S7.339

537,950

Reserve Approve

56,475

S5.771

SO

50

SO

S863

53,454

53,771

510,277

S7.339

537,950

Due Date

2001-OCT-29

2001-OCT-29

2002-JUN-23

2002-JUN-23

2002-JUN-23

2002-FEB-21

2002-MAY-10

2002-MAY-10

2002-MAY-10

2002-MAY-10

Reserve:537,

537,

950 Reserve of Work Report*: W0170.30334

950 Total Remaining

Status of claim is based on information currently on record.

41I12SE2005 2 .21634 CASCADEN 900

2001-Aug-16 11:22 Armstrong-d Page 1 of 1

Ministry ofNorthern Developmentand Mines

Date: 2001-AUG-14

Ministers du Developpement du Nord et des Mines Ontario

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

WALLBRIDGE MINING COMPANY LIMITED 129 FIELDING ROAD LIVELY, ONTARIO P3Y1L7 CANADA

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

Dear Sir or Madam

Submission Number: 2 .21634 Transaction Number(s): W0170.30334

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.

The geophysical portion of this submission has been reviewed by staff of the Ontario Geological Survey.

If you have any question regarding this correspondence, please contact LUCILLE JEROME by email at [email protected] or by phone at (705) 670-5858.

Yours Sincerely,

Ron GashinskiSupervisor, Geoscience Assessment Office

Cc: Resident Geologist

Mark Hall (Agent)Wallbridge Mining Company Limited (Assessment Office)

Assessment File Library

Wallbridge Mining Company Limited (Claim Holder)

Visit our website at http://www.gov.on.ca/MNDM/LANDS/mlsrnnpge.htrn Page: 1 Correspondence 10:16234

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New AMT SURV OPERATIONAL RPT ERMATINGER CASCADEN & … · 2017. 1. 17. · In this coordinate...

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Transcript of New AMT SURV OPERATIONAL RPT ERMATINGER CASCADEN & … · 2017. 1. 17. · In this coordinate...