.....would you be kind enough to recheck that Minnigaff MI for my Lamonts pleas?. I would like to confirm Margaret's year of death is 1874 not 1864. ...
The dates as per the DGFHS booklet are recorded as 1874 for William and 1864 for Margaret.
That may be a transcription error by the transcribers but short of contacting the Minnigaff Heritage group who did the survey I can't verify the dates.
You say they died of variants of TB. Interesting ? If the family were actually involved in the processing of the galena ore from Blackcraig mines their deaths may in fact have been related to lead poisoning. Many a mining family of Wanlockhead and Woodend, the two main lead mines in Dumfriesshire, suffered from lead poisoning.
As for the location of the original village -- it and the mines are today forested over. The land in that area is part of a large Forestry Commission enterprise.