Hello - Not a great deal in the newspapers of that time... found a couple that may help...
Deaths - At Prestonhall Colliery, on the 13th inst., Mr. William Nasmyth, coal-master there.
Dundee, Perth, and Cupar Advertiser - Friday 2st1 September 1860.
At Croftgary, on the 18th inst., by the Rev. R.J. Craig, of Dalgety, Alexander Nasmyth, colliery manager, Donibristle, son of the late William Nasmyth, coal-master, Prestonhall, to Helen, younger daughter of the late Alexander Kelly, Croftgary.
Fifeshire Advertiser - Saturday 22nd April 1876.
Kind regards Tin Miner