COMINCO LTD. GEOPHYSICAL REPORT FOR THE UTEM ELECTROMAGNETIC SURVEY ON THE CLAIR 4 CLAIM FORT STEELE MINING DIVISION, B.C. 4g037'N : 116O15'W

Transcription

1 EXPLORATION NTS.: 82F/9 I COMINCO LTD. WESTERN DISTRICT 1 I P '1 I GEOPHYSICAL REPORT FOR THE UTEM ELECTROMAGNETIC SURVEY ON THE CLAIR 4 CLAIM FORT STEELE MINING DIVISION, B.C. Latitude Longitude 4g037'N : 116O15'W Work Performed by : I. Jackisch & A.P. O'Hara Between July 15th & 31st, 1985 Claim Owner & Operator : COMINCO LTD. - ASSESSMENT REPORT - SEPTEMBER 1985 Syd J. Visser

2 TABLE OF CONTENTS / LIST OF CLAIMS INTRODUCTION DESCRIPTION OF THE UTEM SYSTEM FIELD WORK DATA PRESENTATION DESCRIPTION OF RESULTS REFERENCES APPENDIX I LEGEND - UTEM DATA SECTIONS LEGEND - UTEM COMPILATIONN MAPS APPENDIX I1 APPENDIX I11 \, (, 1 I V APPENDIX V DATA SECTIONS 1-la TO 4-4a STATEMENT STATEMENT OF EXPENDITURES CERTIFICATION PLATE LOCATION MAP ( i n envelope) UTEM COMPILATION MAP ( i n envelope)

3 0 I Kilometres \*+I i CLAIR PROPERTY GENERAL LOCATION MAP

4 EXPLORATION NTS : 82 F/9 COMINCO LTD. GEOPHYSICAL REPORT FOR ME UTEM ELECTROMAGNETIC SURVEY ON THE CLAIR 4 CLAIM LIST OF CLAIMS Comi nco Interest - 100% The claim listed below is partially covered by the grid. # of Record Assessment Name Units # Work Due CLAIR September 25, 1985 INTRODUCTION The CLAIR 4 claim which was recorded on September 25, 1978 i s located about 20 km west of Marysville, B.C., as shown on the location map (Plate ). The area of the geophysical survey described here in located in the St. Mary River valley and is easi ly accessible by road from Marysvi lle, B.C. The claim is underlain by Middle Proterozoic sediments of the Aldridge Formation and Moyie gahbro intrusi ves. orebody near Kimberley, B.C. These sediments are known to host the Sullivan

5 The UTEM EM survey described in this report is an extension of the area surveyed in 1981 and reported on by J.J. Lajoie in April The objective of the survey was to locate geological conductors which may be caused by economic mineral ization. DESCRIPTION OF UTEM SYSTEM UTEM i s an acronym for "University of Toronto ElectroMagnetometer". The system was developed by Dr. Y. Lamontagne (1975) while he was a graduate student of that Uni versity. The field procedure consists of first laying out a large loop of single strand insulated wire and energizing it with current from a transmitter which is powered by a 1.7 kw motor generator. Survey lines are generally oriented perpendicular to one side of the loop and surveying can be performed both inside : and outside the loop. The field procedure is similar to Turam, a better known - el ectromagneti c survey i ng method. The transmitter loop is energized with a precise triangular current waveform at a carefully controlled frequency ( Hz for this survey). The receiver system includes a sensor coi 1 and backpack portable receiver module which has a digital recording facility on cassette magnetic tape. The time synchronization between transmitter and receiver is achieved through quartz crystal clocks in both units which must be accurate to about one second in 50 years. L/ The receiver sensor coil measures the vertical magnetic component of the electromagnetic field and responds to its time derivative. Since the transmitter current waveform is triangular, the receiver coil w i l l sense a perfect square wave in the absence of geologic conductors. Deviations from a perfect square wave are caused by electrical conductors which may be geologic or cultural in origin. The receiver stacks any pre-set number of cycles in order to increase the signal to noise ratio.

6 CI The UTEM receiver gathers and records 9 channels of data at each station. The higher number channels (7-8-9) correspond to short time or high frequency while the lower number channels (1-2-3) correspond to long time or low frequency. Therefore, poor or weak conductors will respond on channels 9, 8, 7 and 6. Progressi vely better conductors wi 11 give responses on progressively 1 ower number channel s as we1 1. For example, massive, highly conducting sulphides or graphite will produce a response on all nine channels. It was mentioned above that the UTEM receiver records data digitally on a cassette. This tape is played back into a computer at the base camp. The computer processes the data and controls the plotting on an 11" x 15" graphics plotter. Data are portrayed on data sections (D.S.) as profiles of each of the nine channels, one section for each survey line. {*- i i. 1 FIELD WORK The UTEM survey described in this report covers an area of approx. 1.5 km by 2.0 km (Plates ). Four lines, for a total of 8 km were surveyed by I. Jackisch and A.P. O'Hara, during the period from July 15th to July 31st, The 1 ines were spaced at 500 m intervals with stations every 50 m (some detailing was done at 25 m intervals). Nine channels of the vertical component (Hz) were measured and recorded at each station. The data was later plotted as shown on the data sections (D.S.). DATA PRESENTATION The results of the survey are presented here on one location map, one compilation map and 8 data sections: D.S. 1-la to 4-4a. i kd'

7 The maps are listed as follows:-. Plate Location Map (i n envel ope) Sca'le 1:50,000 Plate UTEM Compilation Map (in envelope) Scale 1: 10,000 Legends for both the UTEM compilation map and the data sections are also attached. I I I In order to reduce the field data, the theoretical primary field of the loop must be computed at each station. The normalization of the data is as follows:- a) For Channel 1: % Ch.1 anomaly = Ch.1 - P, 100 N i where P is the primary field from the loop at the station and Ch.1 is the observed amp1 itude of Channel 1 b) For remaining channels (n = 2 to 9) % Ch.n anomaly = (Ch.n - Ch.1) x 100 N i where Ch.n is the observed amplitude of Channel n (2 to 9) N i = N i = i = i = Ch.1 for Ch.1 normalized P for primary field normalized is the data station for continuous normalized (each reading normal ized by different primary field) (is the station below the arrow on the data sections for point normalized (each readi ng normal i zed by same primary f i el d)

8 C, DESCRIPTION OF RESULTS The 1985 Clair UTEM survey shows a shallow, poor conductivity zone with a width of approx. 1,000-1,500 m striking across the grid. This conductive zone is not a Sullivan orebody-type target because its indicated 0. conductivity-thickness product is too low. Submi tt ed -by : ddqa #dm,, byd J. Visser Geophysicist Endorsed by: J. M. Hami lton Manager, Expl orat i on Western District DISTRIBUTION: Mining Recorder (2) Kootenay Expl orati on (2) Western Di st ri ct (1 Geophysi cs Group (1)

9 REFERENCES 0 Lamontagne, Y., 1975 Applications of Wideband, Time-Domain EM Measurements in Mineral Exploration: Doctoral Thesis, University of Toronto Lajoie, J.J., April 1982 Geophysical Report for the UTEM Electromagnetic Survey on the CLAIR 2, 4, 14 & 15 Claims Assessment Report

10

11 LEGEND UTEM COMPILATION MAPS Axis of a crossover anomaly. The number indicates the latest anomalous channel. Area where conductivity is higher than average background. Depth indicated by: S - Shallow ( < 50 m) M - Moderate ( m) D - Deep ( > 100 m) Outline of a transmitter loop. Conductor axis located by crossover anomalies with a conductance determination. The conductance is the interpreted conductivity xlthickness of the conductor in mhos (same as Siemens). Only the principal crossovers are indicated.

12 LEGEND UTEM DATA SECTIONS ORDINATE : Amplitude scale is given -in % ABSCISSA: Station or Picket Numbers in Hundreds of Meters L SYMBOL CHANNEL MEAN DELAY TIME 15 Hz 30 Hz I / ms ms 6-4 \ Cf 1 A 7 x A S t

13 A P P E N D I X I 1 DATA SECTIONS 1-la TO 4-4a

14 Arra CLAIR COMINCO cpratw IJBAOH frrqchz> Loopno 7 Llne 0N conponant HZ rscondary Ch I normal lz-d Ch I rrducsd -

15 Arra CLAIR COMINCO oporator IJ&AOH frrqchz) Loopno 7 Llm 0N conponrnt HZ rrcondary Ch I normal lzrd Ch I rrduoad

16 E a b - - a C E b B 2 t Arra CLAIR COMINCO operotor IJBAOH freqchz) Loopno 7 Llne 500s cornpon.nl Hz oecondary Ch I normal lzed Ch I reduced

17 Area CLAIR COMINCO operalor IJgAOH freqchz) Loapno 7 Llm 500s component Hz -econda,ry Ch I normal lzed Ch I reduced

18 Arra CLAIR COMINCO oparator IJgAOM. frrqchr> Loopno 7 Llns 1000s oomponrnl HZ rrcondory Ch I normal lzed Ch I reduoed

19

20 Arra CLAIR COMINCO oprrator IJBAOH fr-qchz) e e 0 6 PI t I? w PI - - w L-pno 7 Lln component Hz -.condary h l normal lzed Ch 1 reduoad

21 Area CLAIR COMINCO oprralor IJBAOH frrq(hz> Loopno 7 LIna 1500s componrnl HZ rroondary Ch I normal lzed Ch I rrducrd

22 APPENDIX I11 IN THE MATTER OF THE B.C. MINERAL ACT AND I N THE MATTER OF A GEOPHYSICAL PROGRAMME CARRIED OUT ON THE CLAIR CLAIM 4 LOCATED 20 KM WEST OF MARYSVILLE, B.C. IN THE FORT STEELE MINING DIVISION OF THE PROVINCE OF BRITISH COLUMBIA, MORE PARTICULARLY N.T.S. 82 F/9 S T A T E M E N T I, SYD J. VISSER, of the Municipality of Delta in the Province of British Columbia, make oath and say:- (; 1) THAT I am employed as a geophysicist by Cominco Ltd. and as such have a personal knowledge of the facts to which I hereinafter depose; 2) THAT annexed hereto and marked as "Exhibit A", to this statement is a true copy of expenditures incurred on geophysical survey on the CLAIR mineral claim; 3) THAT the said expenditures were incurred between July 15th and July 31st, 1985, for the purpose of mineral exploration of the above-named claim.,. Visser, B.Sc.

23 APPENDIX I V "EXHIBIT A" STATEMENT OF GEOPHYSICAL EXPENDITURES CLAIR CLAIM 1) SALARIES Preparation, Field Work, MoblDemob, Interpretation, etc. Geophysicists Assistants - - Ingo Jacki sch - Austin OIHara 2) EQUIPMENT AND TRUCK RENTAL 3) EXPENSE ACCOUNTS (Hotels, Meals, etc) Total Cost I c ertify this to be a true statement of expenditures for the geophysical survey on the CLAIR 4 Claim in Ge6di;hysici s t Cominco Ltd.

24 APPENDIX V C E R T I F I C A T I O N I, SYD J. VISSER, of th Street in the Municipality of Delta, in the Province of British Columbia, do hereby certify that: 1. I graduated from Haileybury School of Mines in 1971 as a Mining Technician and from the University of British Columbia in 1981 with Honours B.Sc. Geology. in Geophysics and 2. I have worked in mineral exploration since 1968.

25

26