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The Dahlberg
dry rocker is a manually operated,
gravity separation device that does not
need an engine or motor to operate it.
The rocking action of the dry rocker
settles the gold and other heavy
material in a trough located within the
dry rocker. The lighter material goes
out the outlet end of the dry rocker and
the heavier material containing the gold
settles in the trough. The heavier
material is prevented from going out the
outlet by a nugget trap at the far end
of the trough. Anything larger than ¼
inch in diameter remains on the grizzly
screen and then rolls off when the dry
rocker is rocked backward. After the dry
rocker has been operated for awhile
there will be a pile of rocks over ¼
inch in diameter at one end and a pile
of the lighter material at the other end
of the dry rocker.
The dry rocker
is designed to be used with dry
material. If the material being
processed is damp, the lighter material
and heavier material will stick together
and not separate properly. If a
desirable area has been found, a
waterproof tarp may be placed over the
location in case it should rain. Weigh
the tarp down with rocks or dirt to
prevent it blowing away if the wind
comes up.
To operate the
dry rocker, shovel the material being
processed onto the grizzly screen. Then
rock the dry rocker forward so that the
material is pushed against the backstop
at the far end of the grizzly screen and
then rock the dry rocker backward . By
using the dry rocker in that manner the
material traverses the screen twice and
is screened more thoroughly. A gentler
rocking action at first settles the
heavy material and then greater rocking
action helps expel the lighter material.
To empty the
dry rocker, it is rocked fully backward
and the concentrate or heavier material
containing the gold is emptied from the
inlet of the dry rocker into a 16 inch
diameter gold pan or other suitable
container. The concentrate is panned or
otherwise classified to recover the
gold.
The dry rocker
is 24 inches in diameter and 11 inches
wide. The two sides are made of ¼ inch
thick plywood. At the inlet of the dry
rocker is a grizzly which consists of a
¼ inch mesh grizzly screen, a steel
backstop and a grizzly chute. The
material that falls through the grizzly
screen drops into the grizzly chute and
is directed to the inlet end of the dry
rocker trough. The trough is made of
thin steel. The dry rocker trough is
held in place by ½ inch thick plywood
trough holders. The dry rocker nugget
trap is located near the outlet end of
the trough.
The dry rocker
may be operated with one hand if
desired. It is suspended on two ball
bearings and is counter- balanced . The
dry rocker is very quiet. It produces
less dust than most dry washers. There
is no motor to start or shut down when
using it. The only tools needed are two
10 inch adjustable wrenches for removing
the dry rocker legs for easier
transport. I prefer using a
narrow-bladed garden shovel for digging
in hard ground. A pick or bar may be
used for breaking up very hard packed
ground. The dry rocker may be emptied
often or may be used for an extended
period of time without emptying if
desired.
The Dahlberg
dry rocker can be operated in remote
areas where gasoline and oil are not
available. It does not require any
special skill to operate. Shoveling
material into it is the hardest part of
the operation. It weighs about 50 pounds
and may be lifted with the two handles
easily. Without the legs it is 24 inches
in diameter and can be transported in
most vehicles. The legs are easily
removed.
Price $450 - Plus Shipping
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