Dear Ramesh
As a matter of fact, the contract in question should be studied and then any decision is to be taken. However on the basis of what you have written please note that contractor labour are not entitled to bonus under the provision of Payment of Bonus Act. You may refer to Gasliton Colliery Vs workmen 1954, I LLJ, 144 : 1953 LAC 525 and Cominco Binani Zinc Ltd. Vs Pappachan, 1989 , I LLJ. 452 , Kerala High Court. for full clarity on this matter.
Mohan.