b'Environmental geophysicsfrequency-domain electromagnetics (a CMD Explorer terrain conductivity meterFigure3), time-domain electromagnetics (aZonge NanoTEM systemFigure 4), and ground penetrating radar (a Mala systemnot shown). We even brought along a hand-portable drilling system, installed a few piezometers, and vlogged the holes using a Vista Clara Dart system. We shipped over nearly 750 kg of equipment and used it all (yup, bragging slightly!).One of the more interesting results that we found in this study is illustrated in Figure 5, which shows the resistivity survey data collected over Site 3 (one of the six major survey areasits location is indicated with an arrow on Figure 1). In this survey we found a contact between highly Figure 3.Collecting ground conductivity data at one of the survey sites. resistive soil and rock to the west (the blue coloured zone), and much more conductive material to the east (the red zone)this contact shows up in all of the data sets collected, it just shows up the best in the resistivity. Our interpretation is that there is a contact between two rock types at this place, and that the conductive zone to the east is likely to be a salt deposit. Interestingly, on returning to the area in 2019 for follow-up work, we had a meeting with some local government officials (presenting them with a poster of our results in Lao), and they told us that the locals in that area had always had trouble with salty water and, in fact, were harvesting salt (Figure6). Nevertheless, it would still be very interesting to drill a borehole into this anomaly to ensure that our interpretation is correct. If the conductive zone is associated with a salt deposit then (a) we could Figure 4.Collecting shallow TEM data at one of the survey sites. be confident in our interpretation and Figure 5.Resistivity data collected at Site 3. A resistive zone, possibly hard rock, is apparent on the left of the section and a conductive zone, possibly a salt deposit, is apparent on the right of the section.33 PREVIEW APRIL 2019'