minetest.register_ore({
  ore_type        = "blob",
  ore             = "default:clay",
  wherein         = {"pxs_default:proxima_sand"},
  clust_scarcity  = 32 * 32 * 32,
  clust_size      = 3,
  y_max           = 15,
  y_min           = -15,
  noise_threshold = 0.0,
  noise_params    = {
    offset = 0.5,
    scale = 0.2,
    spread = {x = 5, y = 5, z = 5},
    seed = -316,
    octaves = 1,
    persist = 0.0
  },
})

minetest.register_ore({
  ore_type       = "scatter",
  ore            = "pxs_default:proxima_stone_with_coal",
  wherein        = "pxs_default:proxima_stone",
  clust_scarcity = 8 * 8 * 8,
  clust_num_ores = 8,
  clust_size     = 3,
  y_max          = 64,
  y_min          = -127,
})
