Their selection follows a trio of Youth Olympic Games ranking competitions which have taken place over the past five weeks.
Denton, who is just 14, claimed gold at the Under-19 International Trophy in Portugal and finished as the highest-placed Brit at the Under-19 World Championships in April. She will lead the girls’ team alongside Wiltshire’s Sarah Wilson, Hertfordshire Alex Bousfield and 17-year-old Mitchell, who enjoyed a stellar year in 2017, including claiming gold at a YOG qualifier in Kyrgyzstan last October.
The competition begins with girls’ qualifying on Wednesday, June 13, with boys’ qualifying taking place the following day.
The finals are scheduled for Friday, June 15, (girls’) and Saturday 16th June (boys’) respectively.
The competition will follow the standard modern tetrathlon format which sees all athletes complete a 200m swim and fencing round robin poule before the laser-run (combined running and shooting).
This year’s championships will run alongside the Under-17 Europeans. It is the first time the two events have been merged into one.