As you say Jeremy, Stephen spent a lot of time researching this Memoir, probably over a 10 year period.
More recently, during the last 2 years he was allowed access to some of libraries and archives of the various landowners involved in mining here, which was probably a first time for some of these estates.
Some of the plans were edited by Rick, but it would be impossible to reproduce the large abandonment plan, which is found in the library of BGS Edinburgh.
Fig 23 p99 gives just a 'flavour' of this plan.