Second , it had coal deposits , and coal mining in the parish took off in the late 18th century .
First , it had a good harbour which was ultimately developed into Port Talbot , named in honour of the squires of Margam .
Margam had coal deposits , and coal mining in the parish took off in the late 18th century .
First , it had a good harbour which was ultimately developed into Port Talbot , named in honour of the squires of Margam .