Detect mined stone in area

summon falling_block ~ ~.6 ~ {Block:chain_command_block,TileEntityData:{Command:"fill ~ ~ ~ ~ ~2 ~ air"},Time:1,Passengers:[{id:falling_block,Block:redstone_block,Time:1,Passengers:[{id:falling_block,Block:activator_rail,Time:1,Passengers:[{id:commandblock_minecart,Command:"scoreboard objectives add minedblocks dummy MinedInArea"},{id:commandblock_minecart,Command:"scoreboard objectives add minestone stat.mineBlock.minecraft.stone"},{id:commandblock_minecart,Command:"scoreboard objectives add minedirt stat.mineBlock.minecraft.dirt"},{id:commandblock_minecart,Command:"setblock ~ ~-3 ~ repeating_command_block 5 replace {Command:\"scoreboard players set @a[x=0,y=50,z=0,rm=100] minestone 0\",auto:1,TrackOutput:0b}"},{id:commandblock_minecart,Command:"setblock ~1 ~-3 ~ chain_command_block 5 replace {Command:\"scoreboard players set @a[x=0,y=50,z=0,rm=100] minedirt 0\",auto:1,TrackOutput:0b}"},{id:commandblock_minecart,Command:"setblock ~2 ~-3 ~ chain_command_block 5 replace {Command:\"execute @a ~ ~ ~ scoreboard players operation @p minedblocks += @p minestone\",auto:1,TrackOutput:0b}"},{id:commandblock_minecart,Command:"setblock ~3 ~-3 ~ chain_command_block 5 replace {Command:\"execute @a ~ ~ ~ scoreboard players operation @p minedblocks += @p minedirt\",auto:1,TrackOutput:0b}"},{id:commandblock_minecart,Command:"setblock ~4 ~-3 ~ chain_command_block 5 replace {Command:\"scoreboard players set @a minestone 0\",auto:1,TrackOutput:0b}"},{id:commandblock_minecart,Command:"setblock ~5 ~-3 ~ chain_command_block 5 replace {Command:\"scoreboard players set @a minedirt 0\",auto:1,TrackOutput:0b}"},{id:commandblock_minecart,Command:"setblock ~6 ~-3 ~ air"},{id:commandblock_minecart,Command:"setblock ~ ~-1 ~ command_block 0 1 {auto:1,Command:\"kill @e[type=commandblock_minecart,r=1]\"}"}]}]}]}