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Minerals 2022, 12, 1236 7 of 21 Table 1. The locations of the MT/CSEM receivers’ coordinates are presented. Station Coordinates Elevation (m) 0 0 0 0 3 44 44 Distance from Tx (m) 931 1005 1092 1357 10,700 20,584 20,736 ST-01 26◦ 09.4489′ N 49◦59.4567′ E ST-02 26◦ 09.4057′ N 49◦59.3446′ E ST-03 26◦ 09.3652′ N 49◦59.2511′ E ST-04 26◦ 09.2756′ N 49◦59.0329′ E ST-05 26◦ 08.6684′ N 49◦53.4044′ E ST-06 26◦ 07.0260′ N 49◦47.6663′ E ST-07 26◦ 06.8866′ N 49◦47.5993′ E Before applying any task or starting any measurements at the installed stations, the ground resistance—using a digital multimeter for both Ex (north–south electrical field) and Ey (east–west electrical field)—on each receiver station is measured to ensure good (1–3 kohm) contact resistance between electrodes. When the measured resistance was greater than 3 kohm, bentonite (or other clay materials/powders) was added at the bottom of the non-polarized electrodes, and more saline water was added to achieve an acceptable contact resistance. The CSEM (active) measurements were recorded during the day with a 1 kHz sampling frequency, which was switched to MT (passive) during the night with a 40 Hz sampling rate. However, we also utilized MT data from the 1 kHz sampling rate before and after the transmitter was switched on. The detailed description of the type of recording per day is listed in Table 2. We were able to record CSEM data from day 2 to day 4 with trial testing conducted on day 1. During the CSEM measurements, we tested both 50% and 100% duty cycles from the transmitter waveform with a 6 s switching time. Immediately after the first recording, all receivers were checked to see whether they were saturated or not, ensuring that the recorded signal was correctly within the instrument’s measurement range. Figure 4 shows a raw time-series example displayed with the KMS-820 acquisition program for both active (CSEM) and passive (MT) EM measurements. Both measuring modes (MT and CSEM) showed a clear recorded signal for all the E-field and H-field-installed components. The acquisition system stores the transmitter operation logs during the CSEM data acquisition, allowing the analyst to correlate any potential issues in the receivers’ records against any problems that might have occurred during the transmission. Table 2. Types of EM measurements applied by site and for each day. Day 1 (Tx Test and MT) ST-01 ST-02 ST-03 ST-04 ST-05 ST-06 ST-07 - - - STD MT, LOTEM STD MT—Standard MT, LOTEM—long offset transient EM, S20—airloop, and FSEM—focused-source EM. Station Day 2 (CSEM and MT) Day 3 (CSEM and MT) Day 4 (CSEM and MT) STD MT LOTEM STD MT, S20 STD MT, S20 LOTEM STD MT, LOTEM, S20 STD MT, S20 STD MT, S20 STD MT, LOTEM, S20 STD MT, S20 STD MT, S20 STD MT, S20 STD MT, S20 STD MT FSEM, STD MT FSEM, STD MT - - - LOTEM - - - LOTEMPDF Image | First High-Power CSEM
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