The coal trucks are one of the best ways to gain coal. After mining a full inventory of coal, you can put your ores in the carts just to the north. After there is 120 coal in the truck, you can pick up your ore in Seers' Village at the other end of the tracks near the bank. Remember that the carts will not hold more than 120 coal. An agility level of 20 is recommended, for faster route. However you can walk around the fishing guild, (by the Moss Giants) and then walk through the gate on the western side to enter this area. Once you've completed a section of the Seers' Village Achievement Diary, you'll be given a headband as a reward. The first stage of this headband allows you to store 140 coal instead of 120. The second stage allows you to store 168 coal, and the last stage allows you to store 196 coal.