Sir Christopher inherited considerable estates from his father, but assiduously purchased additional land, eventually claiming that he could "ride from one side of Cornwall to the other without setting hoof on another man's soil." He bought well over a dozen
manors, many of them – such as the manors of Grampound, of
Mitchell, and of St Ives – to gain possession of rotten boroughs. He acquired the manors of
Cargoll and of Trelundra to further his interests in Mitchell, but whilst attempting to improve some wasteland in Cargoll by deep-ploughing, lead ore was discovered. Sir Christopher set up the Old Shepherds Mine to exploit the lead and found additional silver, making the mine a considerable source of profit before it closed in 1820. Silver-lead ore (
galena) was also discovered at
East Wheal Rose in 1812, which grew to briefly be the largest lead mine in the country.
East Wheal Rose was also the site of Cornwall's worst mining disaster in 1846 when 39 miners drowned in a flood. In 1818 he opened a copper and
tin mine at St Ives, later known as St Ives Consols. At his stream works at
Ladock, near Grampound, gold was found as well as tin. A specimen of Ladock gold was presented to the
Royal Geological Society of Cornwall by Sir Christopher, who also published observations on the find in their
Transactions. Sir Christopher was a partner in the Cornish Copper Company which established a smelting works at
Copperhouse, built a canal to
Hayle and extended the harbour there to export metal and import coal, timber, and other goods. He owned
china clay mines in the
St Austell area and substantially rebuilt the harbour at
Pentewan to serve as a china clay port, connected to St Austell by the
Pentewan Railway, a horse-drawn
tramway. Sir Christopher obtained the post of Vice
Lord Warden of the Stannaries, giving him considerable influence and control over mines and mining in Cornwall. Sir Christopher, known locally as "Sir Kit", extended the grounds but added little to the house, reinforcing his reputation as a miser among his local tenants. The following verse was said to have been fixed to the gates of Trewithen: :A large house, and no cheer, :A large park, and no deer, :A large cellar, and no beer, :Sir Christopher Hawkins lives here. Trewithen House, now a
Grade I listed building, is still privately owned by a family descendant. It houses a portrait of Sir Christopher and is open to the public. ==Patron of steam, horticulture, and antiquarian pursuits==