Mike Dunn is done for the season.

The left-handed Rockies reliever, who has been on the disabled list since July 7, will have surgery on his left AC joint sometime in the next couple of weeks, ending an injury-plagued campaign for the veteran as he posted a 9.00 ERA in 17 innings (25 games).

Dunn originally tweaked his AC joint while working out this past offseason. He had been battling the injury all season.

He was originally scheduled to rejoin Colorado for this week’s series against the San Francisco Giants, but a platelet-rich plasma injection and two cortisone injections couldn’t help him overcome setbacks during his recent rehab stint with Triple-A Albuquerque.

“After my last outing, and the pain that I went through, I woke up the next day and I was at ease with (my season ending),” Dunn said. “I tried to push through it. I tried to come back through every option that I possibly could and then some by getting that extra cortisone shot there at the end. It just didn’t hold up.”

The left-hander expects to return to a normal throwing program in the offseason in order to be ready for the 2019 season.

Butera gets first start in Colorado

Recently acquired catcher Drew Butera, whom the Rockies traded to the Kansas City Royals for pitcher Jerry Vasto, got his first start in a Colorado uniform for Monday’s series opener against San Francisco.

Butera, hitting eighth and known for his defensive prowess, said he’s excited to join and contribute to a team in contention.

“Coming into a team that’s in the playoff race, and close to first place, that’s exciting for me,” said Butera, who won the 2015 World Series with the Royals. “We were close to the very bottom (of the American League standings) in Kansas City, so it’s cool to come into a good atmosphere, a fun team and to play for something meaningful.”

About Almonte’s flashy gold chain

One of the organization’s more promising young bullpen arms returned via September call-up, as hard-throwing right-hander Yency Almonte yielded one run in nine innings (seven games) of relief for the Rockies earlier in the summer.

The rookie noted he took away lessons in finesse from his first big-league stint.

“My first couple outings, I was trying to throw as hard as I can and just throw it by guys,” Almonte said. “But after talking to the bullpen guys and coach (Darren Holmes), I’m trusting all my stuff more.”

And while the power pitcher has worked to incorporate more strategy into his approach, one thing won’t ever change — Almonte’s flashy gold chain, a hard-to-miss signature that bops around his neck violently as he throws.

“I got it in Miami just after I signed (in 2012), and I’ve never, ever taken it off,” Almonte said.