diff --git a/a.out b/a.out
index e2d1d5a..0a6f626 100755
Binary files a/a.out and b/a.out differ
diff --git a/display.cmi b/display.cmi
index 027e575..c3df8c6 100644
Binary files a/display.cmi and b/display.cmi differ
diff --git a/display.cmx b/display.cmx
index e7c7b25..e88d1cf 100644
Binary files a/display.cmx and b/display.cmx differ
diff --git a/display.ml b/display.ml
index 41c0474..9dc4b84 100644
--- a/display.ml
+++ b/display.ml
@@ -37,9 +37,14 @@ let coin_magnet_dist = 1. ;;
 
 (* -------------------------------------------------------------------------------------------------------- *)
 
-let structure_1_frequency = 2500 ;;
 (* avg number of chunk generation required before encountering a structure of type 1 *)
+let structure_1_frequency = 2500 ;;
 
+(* 0 ~ 1000 *)
+let oreMissChance = 50 ;;
+
+(* avg number of chunk generation required before encountering a structure of type 2 *)
+(* NOTE : structure 2 attempts to spawn after structure 1, so the odds will be ever so slightly less than this number *)
 let structure_2_frequency = 2500 ;;
 
 (* -------------------------------------------------------------------------------------------------------- *)
@@ -1242,7 +1247,8 @@ let generate_structure_1 hash mem ch_x ch_y ch_z =
             for i = 0 to chunk_size -1 do
               for j = 0 to chunk_size -1 do
                 for k = 0 to chunk_size -1 do
-                  dyn_append filled {flag = "10" ; cube = create_cube (chx*chunk_size+i) (chy*chunk_size+j) (chz*chunk_size+k) 1; red = 250; green = 250; blue = 64};
+                  if (Random.int 1000 >= oreMissChance) then
+                    dyn_append filled {flag = "10" ; cube = create_cube (chx*chunk_size+i) (chy*chunk_size+j) (chz*chunk_size+k) 1; red = 250; green = 250; blue = 64};
                 done
               done
             done;
@@ -1353,8 +1359,10 @@ let generate_structure_2 hash mem ch_x ch_y ch_z =
             for i = 0 to chunk_size -1 do
               for j = 0 to chunk_size -1 do
                 for k = 0 to chunk_size -1 do
-                  let (cOre, cColors) = generate_random_ore () in
-                  dyn_append filled {flag = cOre ; cube = create_cube (chx*chunk_size+i) (chy*chunk_size+j) (chz*chunk_size+k) 1; red = cColors.(0); green = cColors.(1); blue = cColors.(2)};
+                  if (Random.int 1000 >= oreMissChance) then begin
+                    let (cOre, cColors) = generate_random_ore () in
+                    dyn_append filled {flag = cOre ; cube = create_cube (chx*chunk_size+i) (chy*chunk_size+j) (chz*chunk_size+k) 1; red = cColors.(0); green = cColors.(1); blue = cColors.(2)};
+                  end
                 done
               done
             done;
diff --git a/display.o b/display.o
index 7088449..7c302ab 100644
Binary files a/display.o and b/display.o differ