A simple minecraft script that digs holes leaving only valuable ore in place. Written with Blocky on learntomod.com

digger.js

var currentBlock;
var depth;
var drone;
var i;
var keep;
var keepIndex;
var length2;
var width;

function cube(length2, width, depth) {
  var i_inc = 1;
  if (1 > depth) {
    i_inc = -i_inc;
  }
  for (i = 1;
       i_inc >= 0 ? i <= depth : i >= depth;
       i += i_inc) {
    drone.down(1);
    level(width, length2);
  }
  drone.up(depth);
}

function level(width, length2) {
  var i_inc2 = 1;
  if (1 > width) {
    i_inc2 = -i_inc2;
  }
  for (i = 1;
       i_inc2 >= 0 ? i <= width : i >= width;
       i += i_inc2) {
    drone.right(1);
    row(length2);
  }
  drone.left(width);
}

function main() {
  drone = (new Drone(me, me.location));
  cube(3, 5, 2);
}

function mine() {
  keep = [(Material.EMERALD_ORE), (Material.GOLD_ORE), (Material.LAPIS_ORE), (Material.REDSTONE_ORE), (Material.IRON_ORE), (Material.DIAMOND_ORE), (Material.COAL_ORE)];
  currentBlock = ((drone.getLocation()).getBlock());
  keepIndex = keep.indexOf(currentBlock.getType()) + 1;
  if (keepIndex > 0) {
    drone.box((Material.AIR));
  }
}

function row(length2) {
  var i_inc3 = 1;
  if (1 > length2) {
    i_inc3 = -i_inc3;
  }
  for (i = 1;
       i_inc3 >= 0 ? i <= length2 : i >= length2;
       i += i_inc3) {
    mine();
    drone.fwd(1);
  }
  drone.back(length2);
}