Code (Text):

1. every 80 ticks in {world here}:
2.     loop all players:
3.         loop all blocks in radius {range} around loop-player:
4.             if loop-block is {type of block}:
5.             drop {amount} {item}

NOT TESTED

--- Double Post Merged, Nov 24, 2020, Original Post Date: Nov 24, 2020 ---

fixed code:

Code (Text):

1. every 80 ticks in "{put world}":
2.     loop all players:
3.         loop all blocks in radius {put radius} around loop-player:
4.             if loop-block is {put type}:
5.                 drop {put amount} {put type} at loop-block's position

examples:

Code (Text):

1. every 80 ticks in "fart land":
2.     loop all players:
3.         loop all blocks in radius 200 around loop-player:
4.             if loop-block is brown wool:
5.                 drop 1 dirt at loop-block's position
6.             if loop-block is ice:
7.                 drop 1 blue dye named "&1Ice Shard" at loop-block's position

Code (Text):

1. every 80 ticks in "log place":
2.     loop all players:
3.         loop all blocks in radius 50 around loop-player:
4.             if loop-block is spruce log:
5.                 drop 1 diamond at loop-block's position

EDIT:
you can still use things like:

Code (Text):

1. drop 1 coal above loop-block's position