During this Selangor Civil War, the tin mines were abandoned. The neglect during this time caused them to become flooded. When the war was over, and when the miners returned after the war, they found that the mines were now unworkable due to flooding. Yap Ah Loy managed to persuade the miners and coolies to remain in KL and also persuaded the Malays in surrounding districts to grow rice and other garden products. He opened a Tapioca Mill in Petaling Street where the tubers from his farms were brought to be ground into flour. Petaling Street is fondly called 'Chee Cheong Kai' in Cantonese which means Starch Factory Street.