When playing with Bob's and Angel's, when setting the recipe on the mining depot, it shows not just Angel's ores but also Bob's ores. If you select one of Bob's ores, you get this:
Error while running event Mining_Drones::on_script_path_request_finished (ID 112)
Mining_Drones/script/mining_depot.lua:34: attempt to index field 'products' (a nil value)
stack traceback:
Mining_Drones/script/mining_depot.lua:34: in function 'get_main_product'
Mining_Drones/script/mining_depot.lua:52: in function 'get_product_amount'
Mining_Drones/script/mining_depot.lua:716: in function 'handle_path_request_finished'
Mining_Drones/script/mining_depot.lua:865: in function 'handler'
core/lualib/event_handler.lua:44: in function <core/lualib/event_handler.lua:42>
The right fix is perhaps to figure out not to show Bob's ores with these mods?