The Spireites have agreed to extend young defender Jack Broadhead's loan spell at non-league Buxton.
Broadhead, who has spent a month with the Evo-Stik League Northern Premier side, will remain at Silverlands until November 17.
He has been given permission to play for the Bucks in the FA Cup and the FA Trophy but he will not be eligible for the Derbyshire Senior Cup. There is a 24-hour recall clause in the agreement.
The 19-year-centre-back made his senior debut as a substitute against Hartlepool in the FA Cup last November and signed his first professional contract in the same month.