Resuming on 336-6, it was honours even for the first session as Glamorgan added 95 more runs for the loss of their last four wickets.
Colin Ingram fell for 81 in the first over, hooking Blair Tickner straight to fine leg, but a stand of 86 between van der Gugten and Gorvin (39) occupied most of the morning.
Tickner bowled fast and short while Anuj Dal beat the bat without success before the batting pair settled in to accumulate gently.
Spin eventually did the trick for Derbyshire as former Glamorgan skipper David Lloyd claimed two wickets and Alex Thomson one to finish the innings off.
Lloyd fell for two in the first over of the visitors’ reply as he dragged an attempted drive off Asitha Fernando onto his stumps.
The Sri Lankan proved expensive but Glamorgan’s change bowlers put Derbyshire in trouble as Gorvin’s first ball saw Harry Came caught behind down leg-side, Ned Leonard had the in-form Wayne Madsen slashing to slip and Gorvin induced prolific Australian Caleb Jewell (34) to chip a return catch at 72-4.
Guest and Andersson counter-attacked judiciously in a stand of 76 before another cluster of three wickets on a pitch which was starting to look two-paced.
Gorvin bowled Andersson and had Dal brilliantly stumped by Chris Cooke second ball.
Meanwhile fellow medium-pacer Zain Ul Hassan deceived Guest with a ball that moved slightly and kept low, as he conceded just a single off his first five overs.
But the visitors found some resistance late in their day with a half-century stand between the injured Luis Reece, batting with a runner and restricted because of a hamstring problem, and Thomson who was dropped at slip off Ul Hassan on 12.
With Thomson playing the odd attacking shot to reach 32 not out and give Derbyshire hope of avoiding the follow-on, Glamorgan were unable to make further inroads in the last 75 minutes, but still remained in charge at the half-way stage for the first time in the season.
BBC News
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