diff --git a/mods/default/mapgen.lua b/mods/default/mapgen.lua
index 45affbaf8a..5e251749a7 100644
--- a/mods/default/mapgen.lua
+++ b/mods/default/mapgen.lua
@@ -53,18 +53,18 @@ function default.register_ores()
 		ore_type         = "blob",
 		ore              = "default:clay",
 		wherein          = {"default:sand"},
-		clust_scarcity   = 24 * 24 * 24,
-		clust_size       = 7,
+		clust_scarcity   = 16 * 16 * 16,
+		clust_size       = 5,
 		y_min            = -15,
 		y_max            = 0,
-		noise_threshhold = 0,
+		noise_threshhold = 0.0,
 		noise_params     = {
-			offset = 0.35,
+			offset = 0.5,
 			scale = 0.2,
 			spread = {x = 5, y = 5, z = 5},
 			seed = -316,
 			octaves = 1,
-			persist = 0.5
+			persist = 0.0
 		},
 	})
 
@@ -74,18 +74,18 @@ function default.register_ores()
 		ore_type         = "blob",
 		ore              = "default:sand",
 		wherein          = {"default:stone"},
-		clust_scarcity   = 24 * 24 * 24,
-		clust_size       = 7,
-		y_min            = -63,
+		clust_scarcity   = 16 * 16 * 16,
+		clust_size       = 5,
+		y_min            = -31,
 		y_max            = 4,
-		noise_threshhold = 0,
+		noise_threshhold = 0.0,
 		noise_params     = {
-			offset = 0.35,
+			offset = 0.5,
 			scale = 0.2,
 			spread = {x = 5, y = 5, z = 5},
 			seed = 2316,
 			octaves = 1,
-			persist = 0.5
+			persist = 0.0
 		},
 	})
 
@@ -95,18 +95,18 @@ function default.register_ores()
 		ore_type         = "blob",
 		ore              = "default:dirt",
 		wherein          = {"default:stone"},
-		clust_scarcity   = 24 * 24 * 24,
-		clust_size       = 7,
-		y_min            = -63,
+		clust_scarcity   = 16 * 16 * 16,
+		clust_size       = 5,
+		y_min            = -31,
 		y_max            = 31000,
-		noise_threshhold = 0,
+		noise_threshhold = 0.0,
 		noise_params     = {
-			offset = 0.35,
+			offset = 0.5,
 			scale = 0.2,
 			spread = {x = 5, y = 5, z = 5},
 			seed = 17676,
 			octaves = 1,
-			persist = 0.5
+			persist = 0.0
 		},
 	})
 
@@ -116,18 +116,18 @@ function default.register_ores()
 		ore_type         = "blob",
 		ore              = "default:gravel",
 		wherein          = {"default:stone"},
-		clust_scarcity   = 24 * 24 * 24,
-		clust_size       = 7,
+		clust_scarcity   = 16 * 16 * 16,
+		clust_size       = 5,
 		y_min            = -31000,
 		y_max            = 31000,
-		noise_threshhold = 0,
+		noise_threshhold = 0.0,
 		noise_params     = {
-			offset = 0.35,
+			offset = 0.5,
 			scale = 0.2,
 			spread = {x = 5, y = 5, z = 5},
 			seed = 766,
 			octaves = 1,
-			persist = 0.5
+			persist = 0.0
 		},
 	})