Working at Mill Operator II - Sierrita - Green Valley, AZ

We encourage you to take some time to explore your career opportunities at Freeport-McMoRan. Employee who under general supervision safely performs duties related to the production of copper and/or molybdenum concentrates in the Mill at a highly skilled level.

Freeport-McMoRan is a premier U.S.- based natural resource company successful history of conducting business in a safe, highly efficient and socially responsible manner. The Company has a dynamic portfolio of operating, expansion and growth projects in the mining industry

Working at Mill Operator II - Sierrita - Green Valley, AZ

We have the assets, the talent, the drive and the financial strength to provide attractive and rewarding careers for our employees. We encourage you to take some time to explore your career opportunities at Freeport-McMoRan.

Employee who under general supervision safely performs duties related to the production of copper and/or molybdenum concentrates in the Mill at a highly skilled level.

• Completes duties within the Mill process which could include tasks within the following areas: fine crushing plant, COB, ball mill, roughers, cleaners, flotation cells, moly plant, copper moly thickeners, tailing thickeners, and mill control room
• Takes process readings and makes necessary process changes or adjustments
• Uses electronic process monitoring system to monitor conveyor, plant systems and equipment
• Performs start-up and shut-down of plant or related systems
• Mentors and trains other employees
• Acts as Fill-in Supervisor as needed
• Operates processing equipment and makes adjustments as needed
• Performs basic maintenance on processing equipment and reports maintenance issues
• May operate mobile equipment such as front-end loaders, forklifts, skid-steer loaders, and overhead cranes
• Performs area housekeeping duties and may perform work area and safety audits
• Performs other duties as required

Minimum Qualifications

• Two (2) years of experience in Mill Process Operations
• Knowledge of the wet grind system and flow systems through mill and flotation area
• Knowledge of the filtering and drying process
• Knowledge of placard system to accurately identify hazardous materials
• Knowledge of environmental policies and responsible for reporting any issues and/or concerns
• May be required to complete HAZMAT training as required by Department of Transportation (DOT) regulations

Qualifications

Preferred

• High School diploma or GED

Criteria/Conditions

• Ability to understand and apply verbal and written work and safety-related instructions and procedures given in English
• Ability to communicate in English with respect to job assignments, job procedures, and applicable safety standards
• Must be able to work in a potentially stressful environment
• Work is performed in a mine or manufacturing plant setting, which may include exposure to extremes in temperature and humidity, moving mechanical parts, risk of electrical shock, toxic chemicals, explosives, fumes or airborne particles
• While performing the duties of this job, the employee is required to stand, sit, demonstrate manual dexterity, climb stairs and ladders, work on elevated platforms and work in confined spaces
• Occasionally may be required to lift up to fifty (50) pounds during the course of the work day
• Will be required to work rotating shifts in a 24/7/365 operation
• Personal protective equipment is required when performing work in a mine, outdoor, manufacturing or plant environment, including hard hat, hearing protection, safety glasses, safety footwear, and as needed, respirator, rubber steel-toe boots, protective clothing, gloves and any other protective equipment as required
• Freeport-McMoRan promotes a drug/alcohol free work environment through the use of mandatory pre-employment drug testing and on-going random drug testing as per applicable State Laws

Freeport-McMoRan has reviewed the jobs at its various office and operating sites and determined that many of these jobs require employees to perform essential job functions that pose a direct threat to the safety or health of the employees performing these tasks or others.  Accordingly, the Company has designated the following positions as safety-sensitive:

• Site-based positions, or positions which require unescorted access to site-based operational areas, which are held by employees who are required to receive MSHA, OSHA, DOT, HAZWOPER and/or Hazard Recognition Training; or
• Positions which are held by employees who operate equipment, machinery or motor vehicles in furtherance of performing the essential functions of their job duties, including operating motor vehicles while on Company business or travel (for this purpose “motor vehicles” includes Company owned or leased motor vehicles and personal motor vehicles used by employees in furtherance of Company business or while on Company travel); or
• Positions which Freeport-McMoRan has designated as safety sensitive positions in the applicable job or position description and which upon further review continue to be designated as safety-sensitive based on an individualized assessment of the actual duties performed by a specifically identified employee.

Equal Opportunity Employer/Protected Veteran/Disability

Nearest Major City

Tucson

Job

Mill Operator II - Sierrita - Green Valley, AZ

Primary Location

United States Arizona Green Valley

Job Vacancy Senior Process Engineer - Bagdad, AZ Freeport-McMoRan

Freeport-McMoRan Job Vacancy Senior Process Engineer - Bagdad, AZ . Freeport-McMoRan is a premier U.S.-based natural resource company with headquarters in Phoenix, Arizona. Freeport operate large, long-lived, geographically diverse assets with significant proven and probable reserves of copper, gold, molybdenum, cobalt, oil and gas.  The Company has a dynamic portfolio of operating, expansion and growth projects in the copper industry and is the world’s largest producer of molybdenum and a significant gold, oil and gas producer.

Freeport-McMoRan have a long and successful history of conducting mining business in a safe, highly efficient and socially responsible manner. Freeport have the assets, the talent, the drive and the financial strength to provide attractive and rewarding careers for employees.

We encourage you to take some time to explore your career opportunities at Freeport-McMoRan. Provide technical advice and guidance for all phases of assigned large/complex Engineering projects and programs, ensuring the successful conclusion of all phases within an appropriate time and at appropriate cost.  

Review Job Senior Process Engineer - Bagdad, AZ , investigate and develop appropriate recommendations regarding assigned Engineering projects.

• Manage projects and serve as Subject Matter Expert (SME) on large/complex site planning/construction, expansion or modifications
• Provide guidance and counsel to the site management team on applicable processes, practices, and existing/proposed local, state and federal regulations
• Contribute to site strategic planning and budgeting efforts for designated Engineering areas
• Develop and evaluate AFE’s (Authorization for Expenditure) for capital funding requests
• May evaluate and administer contracts with vendors for the provision of services and equipment
• May represent the site on Company sponsored steering committees, task forces, or teams
• Perform other duties as assigned


Minimum Qualifications
• Bachelor's degree in an appropriate Engineering discipline and five (5) years of related experience in Engineering or related field, OR
• Master's degree in an appropriate Engineering discipline and three (3) years of related experience in Engineering or related field
• Knowledge of the principles and practices of Engineering
• Able to research and analyze information of considerable difficulty and draw valid conclusions
• Skilled in managing large/complex Engineering projects
• Able to evaluate and implement new methods and techniques for operational improvement
• Ability to develop and maintain awareness of occupational hazards and safety precautions
• Skilled in following safety practices and recognizing hazards
• Ability to communicate effectively, both orally and in writing

Qualifications

Preferred

• Advanced degree or Professional Engineering (PE) Certification
• DCS process control experience
• Seven (7) years of ABB experience
• Electrical and instrumentation experience
• Five (5) years of computer programming, networking, and troubleshooting experience
• Experience with PLC, AB, OVATION, and SCADA
• Microwave and radio communications experience
• Supervisory experience

Criteria/Conditions

• Ability to understand and apply verbal and written work and safety-related instructions and procedures given in English
• Ability to communicate in English with respect to job assignments, job procedures, and applicable safety standards
• Must be able to work in a potentially stressful environment
• Work is in a mine or manufacturing plant setting, which may include exposure to extremes in temperature and humidity, moving mechanical parts, risk of electrical shock, toxic chemicals, explosives, fumes or airborne particles
• While performing the duties of this job, the employee is regularly required to stand, sit, demonstrate manual dexterity, climb stairs and ladders, work on elevated platforms, talk, hear and see
• Occasionally may be required to lift moderately heavy objects up to thirty (30) pounds during the course of the workday
• Personal protective equipment is required when performing work in a mine, outdoor, manufacturing or plant environment, including hard hat, hearing protection, safety glasses, safety footwear, and as needed, respirator, rubber steel-toe boots, protective clothing, gloves and any other protective equipment as required
• Freeport-McMoRan promotes a drug/alcohol free work environment through the use of mandatory pre-employment drug testing and on-going random drug testing as per applicable State Laws

Freeport-McMoRan has reviewed the jobs at its various office and operating sites and determined that many of these jobs require employees to perform essential job functions that pose a direct threat to the safety or health of the employees performing these tasks or others.  Accordingly, the Company has designated the following positions as safety-sensitive:

• Site-based positions, or positions which require unescorted access to site-based operational areas, which are held by employees who are required to receive MSHA, OSHA, DOT, HAZWOPER and/or Hazard Recognition Training; or 
• Positions which are held by employees who operate equipment, machinery or motor vehicles in furtherance of performing the essential functions of their job duties, including operating motor vehicles while on Company business or travel (for this purpose “motor vehicles” includes Company owned or leased motor vehicles and personal motor vehicles used by employees in furtherance of Company business or while on Company travel); or
• Positions which Freeport-McMoRan has designated as safety sensitive positions in the applicable job or position description and which upon further review continue to be designated as safety-sensitive based on an individualized assessment of the actual duties performed by a specifically identified employee.

Equal Opportunity Employer/Protected Veteran/Disability

Nearest Major City

Prescott Valley

Job

Senior Process Engineer - Bagdad, AZ

Primary Location

United States Arizona Bagdad

Videos Gold Refining With Aqua Regia By Machine

Gold refining with aqua regia by machine, after the raw material is impure gold is melted in an induction furnace the form of grains or flakes to be fed to the Aqua region reactor. The Aqua region refining plant comprises of steps mix acid that is aqua reaction as the first step we're an impure alloy is dissolved.

Steam or heating issues as a step to enhance reaction and ensure good efficiency. this aqua region reactor is connected to a fume scrubber which takes care of neutralizing toxic fumes of acid mainly knocks generated due to nitric acid and also hydrochloric acid vapors.

Silver gets converted to white silver chloride crystals which are filtered in the silver chloride filter and once it is ensured that entire silver chloride is filtered.

Then the silver chloride crystals from the filter are collected and accumulated, these are then cemented in silver semen tation unit where it is reduced by a mixture of sodium hydroxide and glucose. The cemented silver is filtered casted into a node bar and is refined to pure silver of 999 quality an electrolytic silver refining setup.

The liquids after filtration of silver from electrolytic refining plant are also collected in liquid storage tanks. Clear gold chloride solution is transferred to another reactor where sodium metabisulfite is charged in as a reducing agent,  then this will precipitate gold from the solution, this is monitored by good pH control and viewing glass reactor for the right change in color.

The cemented gold is then filtered in the gold filter until it is ensured that entire gold is collected this wet gold is 99.5 quality and the liquids left out are transferred to exhaust liquid storage tanks.

Pure gold of 99.5 quality filtered from aqua region refining plant if it needs to be further purified should pass through the process of electrolytic gold refining in order to get 999.9 purity.

All the exhaust liquids are collected in storage tanks are passed through three tanks by overflow systems and then primarily in the first stage copper is cemented which is filtered and collected for further refining. The liquids after copper sementation are treated with alkali solution mixture of calcium and sodium hydroxide. These metallic hydroxy Tsar sedimented which are filtered in a filter press and then after clear water is discharged to drain.

The pure gold sand of 99.5 generated from the Aqua region process is first dried in an oven or it can be pure gold of 99.9 from electrolytic process. This gold is then melted in an induction furnace where after it follows the process depending on the configuration of gold bar desired, for gold bars up to 100 GMS configuration the molten gold is collected in a pre-designed mold for the desired configuration and strips, these gold strips are then passed through the rolling mill where the rollers are set to get the right thickness of the strip's getting converted two sheets.

These sheets are then passed through the cutting press with set of punching so that gold blocks are cut as desired these gold blocks are then annealed to remove oxide by a flame and then cooled and cleaned.

For gold bars above 100 GMS up to killobar configuration. The molten gold is collected in a pre-designed mold for the desired configuration. This is then cooled in the cooling table where bar is formed. A burner flame is used in order that oxides are not formed this is mainly a kneeling step and then the gold bar is cleaned.

Videos Gold Refining With Aqua Regia By Machine

See Also

Video Process Basics How Gold Is Made In The Mining

Gold is the softest and most malleable, metal it can be pressed extremely thin crafted into various shapes even drawn out to form a fine wire. Gold isn't affected by water or oxygen as many metals are so it doesn't rust. Most gold comes from low deposits also called bein deposits concentrations of gold and other metals in the cracks of rocks. Low deposits require hard rock mining, the process of removing gold-bearing rock called or by drilling and blasting

Miners to send more than half kilometer underground there they drill holes for explosives using what's called a long whole air drill. They drill in a specific pattern set out in a plan prepared by the mines engineers. The engineers know exactly where those veins of gold are thanks to the mining companies geologists who studied or samples.

The company collects these samples by drilling deep into the rock at 50-meter intervals. These diamond drill cores as they're called are up to 100 meters long and measure three point five centimeters in diameter.

Gold in its natural state isn't cure it's usually intertwined with silver and other metals, so the mind or has to be processed afterward to isolate and extract the gold. A metric ton of ore yields only about six point five grams of gold. After blasting the rock apart with explosives or miners use what's called a mock machine to transfer the or two cars headed to the main shaft and then above ground to the mill. There a crusher reduces the large chunks into smaller rocks about the size of gravel a mil then processed into a pulp

The factory adds a water and cyanide solution than another mill and flows into large settling tanks. The wet solids being heavier sinks to the bottom, the water the top drains to another area. They transfer the solids to an agitation tank and blowing air the oxygen steps off a chemical reaction between the cyanide and the goal triggering the gold to dissolve and leach into the surrounding water.  

Drum filters then separate the water from the solids. This water now joins the water that was separated earlier they pour in zinc powder to solidify the dissolve gold and four pieces containing both zink and gold. To smelt it into bars they first have to mix several chemicals, manganese dioxide, flew right, silica flower, borax and sodium nitrate. 

This chemical mix called flux will separate the gold from the impurities. Into the smelter whose temperature is a fiery 1,600 degrees Celsius. The rotate smelters so that the contents heat evenly, over two and a half hours the heavier gold eventually sinks to the bottom while the impurities called slag float to the surface.  They pour out the slag taking a sample to make sure it contains gold or no.

The gold cooled slightly so they reheat - 1600 degrees celsius, then cast into bar-shaped molds. The gold takes about four minutes to harden, and then another hour to cool completely in a basin of cold water. Then bullion cleaned of dirt remaining combustion. Gold bars or ingots, this stage the gold is eighty percent pure.

Video Process Basics How Gold Is Made In The Mining 

Precious Metals Analysis For Sampling

A true sample is a small sample of a mask which represents the average composition of the mass or simply stated truly representative of the bulk, uniformity of composition and particle size of the boat material are the key features which lead to selecting the processes required to generate true samples.

Both lots of materials for saddling come in many forms from mick solids like crushed or for scraps circuit boards for recycling to sludge slurries and solutions from industrial processes.

To maximize uniformity of composition fault materials are most often process prior to sampling.

For example scrap metal lots are melted to form alloys for leech to take all the metals into solution for analysis. When the ball contains solid particles imaginas ation for mechanical mixing is a sampling technique employee to create a uniform distribution of particles so that each sample taken from the mixed will represent the average composition.

The uniformity of composition of the starting material greatly affects the amount of reduction needed for true sample

Highly uniform materials require less reduction. fundamental principle of good sampling is to gradually reduce the bulk simultaneously with a gradual reduction in the size of the particles.

Larger sample sizes are required with larger particle size distributions of the bulk. Therefore it is of great value to crush and grind the sample to allow for taking smaller reliable sample. The sample is then mixed thoroughly to obtain a mixture that is homogenized.

For example when salt is completely dissolved into a solution, the solution is thoroughly mixed so that any droplet will contain the same concentration of dissolved salt. in order to get the same amount of thorough mixing with solid particle mixtures, the solid particles must be ground small enough and extensively mixed prior to sampling.

Each type of material for sampling and analysis has optimum ratios for the finest relative to the size of the sample. These ratios must be determined experimentally. middle of the blended and split test samples are taken from lots and sent for analysis.

Essay samples are then taken from the test samples which typically require further grinding and splitting. there are a number of traps that can produce misleading results that karen handling should avoid.

cross-contamination for one sample to the next could occur if sampling equipment is not cleaned adequately between life. care must be taken to collect all of exhaustion crushing grinding or handling fine materials that some does have different metal concentrations than the bone.

Fine particles may also pick up or lose moisture while passing through sampling equipment although they may not appear wet they may contain enough moisture to affect results so this should be accountable.

When samples reach the essay lab they may have segregated so the test sample should also be blended again and split properly.

The ipmi recognizes the importance of this technology to the precious metals community and has published and made available several books on this subject. The sampling and analysis committee of the ipmi also publishes guidelines in this field

Video Precious Metals Analysis For Sampling

See Also:
The Basics Sampling Science for Precious Metals Analysis