Since yesterday my account does not generate more gold as before.
It generates 300 gold every 100 minute with this configuration:

Worker details
Workers: 10
Mine carts: 2
Pickaxe level: 20
Equipment level: 5
Mine details
Gold ores: 5
Iron ores: 3
Coal ores: 2
Gem ores: 2
Chambers: 13

my account : fahmii123