Since some brave adventurers helped the Quarry Master clear out potential land for his brand new Quarry, he has decided to allow players inside, and to trade for some clay.
He can be found inside the foreman hut at his quarry, located near X:-230, Z:390
(https://claytonia.net/forums/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FjrHlbFy.jpg&hash=23fd6c58deac041b6c314e80b381281610f47ce4)
Remember that builds and landscape modifications are strictly prohibited outside your race's city, unless given permission by an admin.
Thanks to Blaidrug for help with the build =D