I have used very hot curry powder with great success.
You can buy a very large packet in the uk for around £3. I just carefully remove the mole hill to reveal the tunnel then i thread as much old garden hose as i can into the tunnel then attach the hose onto a watering can spout full of curried water and let it flow geently into the tunnel . Gently pull the hose out of the tunnel whilst the fluid is lining the length of the tunnel with curry solution.Then repeat on all tunnels. I found that after around 3 weeks i was moleless.
Its not cruel And its organic.
Follow below link for a laugh.