Tech Savvy
- In
this December 2012 photo provided by the U.S. Department of Energy,
Ames Laboratory, materials scientist Ryan Ott, left, and research
technician Ross Anderson examine an ingot of magnesium and rare-earth
metals as part of a project to optimize the process to reclaim rare
earths from scraps of rare-earth-containing magnets in Ames, Iowa.
Across the West, early miners digging for gold, silver and copper had no
idea that one day something even more valuable would be hidden in the
piles of dirt and rocks they tossed aside. Now there Ãs a rush in the
U.S. to find key components of cellphones, televisions, weapons systems,
wind turbines, MRI machines and the regenerative brakes in hybrid cars,
a group of versatile minerals on the periodic table called rare earth
elements and old mining tailings piles just might be the answer.
- In
this 1905 photo provided by the U.S. Geological Survey is a channel in
bedrock worn by tailings of the Cherokee hydraulic mine in Butte County,
Calif. Across the West, early miners digging for gold, silver and
copper had no idea that one day something even more valuable would be
hidden in the piles of dirt and rocks they tossed aside. Now there’s a
rush in the U.S. to find key components of cellphones, televisions,
weapons systems, wind turbines, MRI machines and the regenerative brakes
in hybrid cars, a group of versatile minerals on the periodic table
called rare earth elements and old mining tailings piles just might be
the answer.
- In
this undated photo provided by the U.S. Geological Survey is a rock
sample being analyzed in a Denver laboratory consisting of quartz, fine
grain (microscopic) pyrite, galena and sphalerite. The USGS Mineral
Resources program is looking at samples from previously mined ore that
may contain critical minerals including rare earth elements. Across the
West, early miners digging for gold, silver and copper had no idea that
one day something even more valuable would be hidden in the piles of
dirt and rocks they tossed aside. Now there's a rush in the U.S. to find
key components of cellphones, televisions, weapons systems, wind
turbines, MRI machines and the regenerative brakes in hybrid cars, a
group of versatile minerals on the periodic table called rare earth
elements and old mining tailings piles just might be the answer.
- In
this 1905 photo provided by the U.S. Geological Survey are tailings
from hydraulic mines on Spring Creek in Nevada County, Calif. Across the
West, early miners digging for gold, silver and copper had no idea that
one day something even more valuable would be hidden in the piles of
dirt and rocks they tossed aside. Now there’s a rush in the U.S. to find
key components of cellphones, televisions, weapons systems, wind
turbines, MRI machines and the regenerative brakes in hybrid cars, a
group of versatile minerals on the periodic table called rare earth
elements and old mining tailings piles just might be the answer.
- In
this undated photo released by the U.S. Department of Agriculture are
rare-earth oxides, clockwise from top center: praseodymium, cerium,
lanthanum, neodymium, samarium, and gadolinium. Across the West, early
miners digging for gold, silver and copper had no idea that one day
something even more valuable would be hidden in the piles of dirt and
rocks they tossed aside. Now there’s a rush in the U.S. to find key
components of cellphones, televisions, weapons systems, wind turbines,
MRI machines and the regenerative brakes in hybrid cars, a group of
versatile minerals on the periodic table called rare earth elements and
old mining tailings piles just might be the answer.
Across the West, early miners
digging for gold, silver and copper had no idea that one day something
else very valuable would be buried in the piles of dirt and rocks they
tossed aside.
There's a rush in the U.S. to find
key components of cellphones, televisions, weapons systems, wind
turbines, MRI machines and the regenerative brakes in hybrid cars, and
old mine tailings piles just might be the answer. They may contain a
group of versatile minerals the periodic table called rare earth
elements.
"Uncle Sam could be sitting on a gold mine," said Larry Meinert,
director of the mineral resource program for the U.S. Geological Survey
in Reston, Va.
The USGS and Department of Energy are on a nationwide scramble for
deposits of the elements that make magnets lighter, bring balanced hues
to fluorescent lighting and color to the touch screens of smartphones in
order to break the Chinese stranglehold on those supplies.
They were surprised to find that the critical elements could be in
plain sight in piles of rubble otherwise considered eyesores and toxic
waste. One era's junk could turn out to be this era's treasure.
"Those were almost never analyzed for anything other than what they
were mining for," Meinert said. "If they turn out to be valuable that is
a win-win on several fronts — getting us off our dependence on China
and having a resource we didn't know about."
The 15 rare earth elements were discovered long after the gold rush
began to wane, but demand for them only took off over the past 10 years
as electronics became smaller and more sophisticated. They begin with
number 57 Lanthanum and end with 71 Lutetium, a group of metallic
chemical elements that are not rare as much as they are just difficult
to mine because they occur in tiny amounts and are often stuck to each
other.
Unlike metals higher up on the table such as silver and gold, there's
no good agent for dissolving elements so closely linked in atomic
structure without destroying the target. It makes mining for them
tedious and expensive.
"The reason they haven't been explored for in the U.S. was because as
long as China was prepared to export enough rare earths to fill the
demand, everything was fine — like with the oil cartels. When China
began to use them as a political tool, people began to see the
vulnerability to the U.S. economy to having one source of rare earth
elements," said Ian Ridley, director of the USGS Central Mineral and
Environmental Resources Science Center in Colorado.
Two years ago, China raised prices — in the case of Neodymium, used
to make Prius electric motors stronger and lighter, from $15 a kilogram
in 2009 to $500 in 2011, while Dysprosium oxide used in lasers and
halide lamps went from $114 a kilogram in 2010 to $2,830 in 2011. It's
also about the time China cut off supplies to Japan, maker of the Prius,
in a dispute over international fishing territory.
That's when the U.S. government went into emergency mode and sent geologists to hunt for new domestic sources.
"What we have is a clash of supply and demand. It's a global problem.
A growing middle class around the world means more and more people want
things like cellphones," said Alex King, director of the Critical
Materials Institute of the Department of Energy's Ames Research Lab in
Iowa. "Our job is to solve the problem any way we can."
At the University of Nevada-Reno and University of Colorado school of
mines, USGS scientists used lasers to examine extensive samples of
rocks and ore collected across the West during the gold rush days by
geologists from Stanford University and Cal Tech.
"If we could recycle some of this waste and get something out of it
that was waste years ago that isn't waste today, that certainly is a
goal," said Alan Koenig, the USGS scientist in charge of the tailings
project.
One sample collected in 1870 from an area near Sparks, Nev., where
miners had searched for a viable copper vein, has shown promise and has
given researchers clues in the search for more. They have found that
some rare earths exist with minerals they had not previously known occur
together.
"The copper mine never went into production, but now after all of
this time we've analyzed it and it came back high with Indium, which is
used in photovoltaic panels. It never economically produced copper, but
it gives us insight into some associations we didn't previously
recognize," Koenig said.
Indium also has been found in the defunct copper mine that dominates the artsy southern Arizona town of Bisbee.
Koenig and his colleagues are working to understand the composition
of all of the nation's major deposits sampled over the past 150 years.
In some cases, the mines were depleted of gold or copper, but the rocks
left piled alongside mines and pits could hold a modern mother lode.
"We're revisiting history," he said.
They are compiling data from 2,500 samples to better understand
whether it's possible to predict where rare earths might be hiding based
on the presence of other elements there, too.
"If I had to venture a number, I'd say we have found several dozen
new locations that are elevated in one or more critical metals," Koenig
said. "With this project the goal would be to have this large data base
available that would allow us to predict and to form new associations."
Currently there is only one U.S. mine producing rare earths— at
Mountain Pass in the Southern California desert. Molycorp Inc.'s goal in
reopening the defunct mine is 20,000 metric tons of rare earth elements
by this summer, including cerium oxide used to polish telescope lenses
and other glass.
The USGS is counting on companies like Molycorp to use the
information they've gleaned to uncover other easy-to-reach deposits
sitting on federal land and elsewhere.
"Without rare earths we'd be back to having black-and-white cellphones again," said the USGS's Ridley.