It is believed that the mine stretches for many kilometers, with six kilometers already surveyed. It is known to have nine levels within it, and over 1700 tons of copper are known to have been removed from the mine. This is quite a staggering accomplishment for a society of that era without the use power tools, or at least as we know power tools today.
Great Orme Copper Mine
- The largest typical sledge hammer used today weighs 20 pounds,
- though sledge hammers in the 10 pound class are more commonplace.
A grown man (without back trouble yet) can wield a 20 pound hammer, but only for limited amounts of time. That is, unless smashing masonry and demolition is his livelihood.
In that case, he might do it for several hours at a time. This author owns a 10 pound sledge, and the only words to describe using it are misery, sweat and pain. And not necessarily in that order! It’s very hard to imagine using one of these for mining, day in and day out.
Fig. 1 – Modern 20 pound sledge hammer.
Head on hammer is about the size of a standard house brick.
Standing up, the handle is about 3 feet long. 
- The 60 pound sledge hammer is not currently manufactured. The handle would be 9 feet long, with the metal head about the size of a cement block.
- An even bigger 64 pound sledge hammer was found at the copper mine by archeologists. To lift this 64 pound hammer using only the far end of a 9 foot long handle would be beyond the strength of any man. To swing it with force would be virtually impossible.
- Photo: A 1940’s strongman hoists a 50 pound hammer.
So who or what could have wielded one of these back-breakers? If we scale up the size of the ancient people so they could use this tool, the giants at the copper mine may have been perhaps 12 to 18 feet tall, or about 3 times taller than an average human being of today.
To put this in perspective, the height of the wall in an average home in the United States built within the last 50 years in any given room is just 8 feet.
Perhaps these are the people referred to in the Bible in Genesis, where it says there were giants in [on?] the Earth in those days.
OOPARTS and ancient high technology By Ted Twietmeyer
The 64lb hammer with a more than 9 foot handle will be on display at the museum. Greater Ancestors World Museum
by Greater Ancestors World Museum on Thursday, April 28, 2011 at 9:12pm