I went to the nearest deposit after scanning for coal but when I got to where the scan pointed there was no coal there and I couldn't place a miner. As there doesn't seem to be a way to get your coordinates or something, I'll show a picture and describe the place a little:
There are mountains to the north-west and a big lake with a waterfall next to a plateau to the south-east. The jungle that you can see in the picture seems to go on to the north-east and south-west.
EDIT: The scan just points to a point in the middle of all nearby deposits, there are multiple coal deposits in the jungle around the point that the scan points to. My bad.