Ng of Pangkal Pinang Bangka

I'd like to trace my family genealogy. I was told that I am either the 5th of 6th generation of Chinese migrant that has lived in Indonesian for more than 100 hundred years. My family name is NG (in Hakka) or GOH (in Hokkien). My grandfather's name was NG KONG SAN, he worked for the tin mining company in Pangkal Pinang-Bangka island-Indonesia. My father's name was NG NJOEK HIAN.

I am wondering if anyone can help me.

Thank you