"involving mainly" is correct and usable in written English.
It can be used to describe something that is mostly comprised of certain elements. For example, "The program is a 10 week course involving mainly physical activities."
The French government, after years of obduracy, is proposing a rescue involving mainly the sale of assets, which is likely to be accepted by the European Commission.
In the 1970's, along with many of his fellow artists and intellectuals, he interrupted his modernist ironies and aesthetic explorations -- involving mainly nonlethal clashes with the Communist censorship -- for outright activism.
Acharya said the GGGI has been working to set up an investment service, involving mainly people with banking backgrounds, to support countries in preparing projects that appeal to the private sector.
Felix's aria continues in this droll vein, variations on extortion and protection involving mainly insurance, liquor and the public payroll, the notes soaring until they nearly fly off the page.
They had been trying to enter the country illegally and had apparently suffocated.See article: The deadly trade in peopleViolence involving mainly English fans marred the start of the Euro 2000 football championship.
The themes presented suggest an overlying group culture involving mainly circular walks, reached by car.
Conclusion Discrepancies seem to be common in a medical ICU, involving mainly drug interactions with rather a mild clinical impact.
The operations from 100 to 150 constitute the finishing line operations involving mainly grinding, sursulfing and lapping.
The distribution of abnormal DWI follows a common pattern, involving mainly cortical areas near the midline, the insula, cingulum, and the superior frontal cortex [20].
The weak Raman peak at 716 cm-1, is due to asymmetric stretching mode of the WO6 octahedra, involving mainly vibrations of the equatorial oxygen atoms within layers.
The operations from 10to9090 constitute the roughing line operations involving mainly facing and centering, turning, whirling, drilling, tapping and chamfering.
