The phrase "a mounting number" is correct and usable in written English.
It can be used to describe an increasing quantity or amount of something over time.
Example: "There has been a mounting number of complaints regarding the new policy changes."
Alternatives: "a growing number" or "an increasing number".
But a mounting number of EB-5 deals are also floundering.
The Internet Research Agency has operated with impunity despite a mounting number of Russian investigative reports showing that employees created fake online personas to influence debates online.
Across the country, a mounting number of investigations and lawsuits have focused attention on the justice system's heavy burdens on the poor.
As the Police Department performed a mounting number of stops on New York streets, voices of opposition, slow and scattershot, struggled to be heard.
Ironically, the push for togetherness has come just as remote interaction has become far easier, and a mounting number of studies document the advantages of working from home.
The fresh legal action comes as Rupert Murdoch's UK newspaper group attempts to settle a mounting number of civil claims over alleged voicemail interception by the News of the World, which closed in July 2011.
"Great buy!" Jenkins's offer to sell her final resting place is one of a quickly mounting number of ads that have cropped up in newspapers and on the Internet in recent months as unemployment and heavy debt loads drive more people to scour their homes for assets to sell in hopes of paying the bills of the here-and-now.
Signs of a Campaign The mounting number of attacks that have been traced back to China suggest that hackers there are behind a far-reaching spying campaign aimed at an expanding set of targets including corporations, government agencies, activist groups and media organizations inside the United States.
In particular, the government must get a grip on the mounting number of registered disabled, of which there are many more in the Netherlands than in Germany or Belgium.
Mick Ebeling, co-founder of Not Impossible Labs -- a group that works to "crowd-solve" daunting health care issues -- was inspired to find a way to help the mounting number of amputees in Sudan after reading a particularly heartbreaking story published by Time magazine in 2012.
"It's devastating if you lose someone," she said, a grim reference to the mounting number of suicides in the region.
