They look like metamorphic pyrite nodules, perhaps converted to geothite by weathering.
It seems likely that someone attributed false claims of nickel-steel alloy to this alleged scientist of geology. Without a citation to a primary source, we can toss that assumption out.
We can also toss out the assumption that these "grooves" were created prior to the nodules being buried 2.8 to billion years ago. They surely would have been obliterated by metamorphic process by now.
Limonite, pyrite, and geothite nodules can devlop rings as part of the weathering process, but this story was also carried on an NBC program called
The Mysterious Origins of Man, hosted by Charles Heston. These spheres were also discussed in the pseudoscience pulp titled
Forbidden Archaeology.
In the latter, they cited articles in
Weekly World News, a tabloid known to completely
fabricate stories.
In each of the above sources, only a few of the alleged "hundreds" of spheres had rings carved in them. Only one had "three" rings. Its more likely that they were carved after finding them than anything else.
And as 2inquisitive pointed out, you can get a more detailed explanation at:
http://www.talkorigins.org/faqs/mom/spheres.html